Nature

WTF Fun Fact 13460 – Sharks in a Lake

There’s nothing quite like the ocean. But you can get some beach time in at the lake as well. It used to be a shark-free way to enjoy the water. But not anymore since there have been more than a few reports of sharks in a lake!

If you’ve swum in certain lakes around the globe, you might have shared a swim with these fascinating creatures.

Bull sharks are freshwater fans

While Great Whites may not make an appearance in our freshwater lakes, bull sharks, notorious for their ability to survive in both salt and fresh water, do make an appearance. This survival trick is all thanks to their advanced ability to osmoregulate their livers. This allows them to adapt to varying salinity levels, unlike their fellow hammerhead or tiger sharks.

One of the largest freshwater lakes in the Americas, Lake Nicaragua, sees these adaptable creatures as regular inhabitants. The bull sharks make their way through the San Juan River. They successfully navigate through eight rapids, much like salmon, to reach the lake and may reside in the lake for several years.

They exhibit some impressive rapids-navigation abilities not seen in other bull shark populations.

Unexpected sightings of sharks in a lake

Even a seemingly innocent round of golf can turn into a shark encounter at Queensland’s Carbrook Golf Club in Australia. In 1996, a massive flood seems to have left around six bull sharks trapped in the golf course’s freshwater lake. Since then, the shark population has been a consistent feature of the club.

The bull shark presence is not limited to Australia or the Americas. In Lake Pontchartrain, Louisiana, bull sharks have been spotted and even caught by anglers. A boy was reportedly attacked by a bull shark in 2014 in this lake. The sharks are known to venture more into the lake during the summer. But they retreat back to the Gulf of Mexico towards the year-end.

These fascinating creatures have also been observed in Lake Janoer in New Guinea. Oh, and you might see one in Lake Izabal in Guatemala, Lake Sentani in Indonesia, and Lake Bayano in Panama. (But note that despite a few shark sighting being reported in the Great Lakes, such as Lake Michigan, those have never been scientifically confirmed.)

In a more heartwarming encounter, Lake Maracaibo in Venezuela is home to a bull shark nursery. However, this particular lake may not be the best holiday destination. It holds the world record for the highest number of lightning strikes.

Freshwater lakes aren’t always shark-free

A river swim doesn’t eliminate the risk of encountering a shark. Three species of river sharks exist: the Ganges shark, the northern river shark, and the speartooth shark. These aquatic creatures can be found in the freshwater rivers in India and the brackish estuaries in northern Australia and New Guinea.

But don’t freak out (despite Summer 2023 being the year the ocean seems to be fighting back). It’s essential to remember that shark attacks, whether in the sea or a lake, are exceedingly rare. In fact, have a better chance of being bitten by a New Yorker than a shark!

— WTF fun facts

Source: “Shark-Infested Lakes Exist And You Might Have Already Swum In One” — IFL Science

WTF Fun Fact 13457 – Crocodile’s Virgin Birth

In a scientific breakthrough, researchers have recorded the first known instance of a crocodile’s virgin birth. The female American crocodile lived in isolation for 16 years at a zoo in Costa Rica.

What’s the story behind the crocodile’s virgin birth?

This incredible discovery has revealed a surprising reproductive capability in crocodiles and could provide insight into their prehistoric relatives.

In 2018, the female American crocodile, despite her solitary existence, laid 14 eggs in her enclosure, which is not an uncommon occurrence among captive reptiles. However, things took an unexpected turn when, after three months of incubation, scientists discovered a fully formed, stillborn baby crocodile in one of the eggs.

Genetic analysis of the fetus revealed that this was a result of facultative parthenogenesis (FP), a type of reproduction that occurs without the genetic contribution of males. Essentially, the mother’s egg cell developed into a baby without being fertilized by a male’s sperm cell.

Facultative parthenogenesis explained

In FP, the process of egg cell formation divides a precursor cell into four cells. One of these becomes the egg cell, retaining key cellular structures and the gel-like cytoplasm, while the others contain extra genetic material. Interestingly, one of these cells acts like a sperm cell, fusing with the egg to facilitate fertilization.

While this type of reproduction, colloquially known as a “virgin birth,” has been documented in various species of fish, birds, lizards, and snakes, this is the first-known instance in a crocodile.

The American crocodile is a vulnerable species at risk of extinction. According to one hypothesis, FP may be more prevalent among species on the brink of extinction. The discovery of this unusual reproductive strategy could have significant implications for the conservation of endangered crocodile populations.

A glimpse into the prehistoric past

This astounding discovery in Costa Rica could also open new windows into the ancient past. As the study suggests, the “virgin birth” phenomenon might offer insights into the possible reproductive capabilities of extinct archosaurian relatives of crocodilians and birds, specifically members of Pterosauria and Dinosauria that roamed the earth during the Triassic Period about 250 million years ago.

— WTF fun facts

Source: “Scientists find crocodile ‘virgin birth’ at Costa Rica zoo” — Reuters

WTF Fun Fact 13455 – Bird Nest Spikes

Bird nest spikes sound pretty uncomfortable. But the birds have defeated us since they’re now using anti-bird spikes designed to keep them away as materials to build their nests! Nature always finds a way.

How are birds defeating the spikes?

It’s magpies specifically that are making headlines. They’re the birds that have been found using the anti-bird spikes designed to deter them as construction material for their nests. This fascinating behavior underscores these birds’ remarkable intelligence and adaptability.

Anti-bird spikes are rows of pointed metal or plastic prongs designed to deter birds from perching on buildings, bridges, or statues. People use them when they don’t want birds building nests or leaving droppings in a specific area. And since birds can spread disease, some people see them as dirty.

However, far from being deterred, magpies have decided to turn the tables on humans by using these spikes to their advantage.

Bird nest spikes for a spiteful home

We kid. The birds aren’t spiteful. They’re just trying to survive.

Birdwatchers have observed magpies collecting these anti-bird spikes and weaving them among twigs and branches to create sturdy and secure homes. The supposed deterrents have become a beneficial resource for these intelligent creatures.

Scientists believe that these birds’ unexpected behavior is an example of neophilia, an attraction to new things. Unlike neophobia, a fear of new things common in many animals, neophilia is characteristic of certain bird species, particularly those known for their intelligence like magpies and crows. The anti-bird spikes are new elements in their environment, so the birds investigate them and then find a way to use them to their advantage.

Implications for bird deterrence

The use of anti-bird spikes by magpies challenges the effectiveness of this deterrence method. If the birds can repurpose these structures for their use, their presence may not achieve the intended effect of keeping the birds away. This revelation could prompt a re-evaluation of current bird deterrent strategies.

The behavior of these magpies and crows using anti-bird spikes underscores the impressive cognitive abilities of these birds. It’s yet another example of their capability to adapt to and exploit the human-altered environment, offering further proof that these birds possess a high level of intelligence and problem-solving skills.

The birds’ actions also serve as a reminder of the continuous interplay between wildlife and human spaces. As humans encroach more on natural habitats, animals must adjust and adapt to survive. These magpies and crows turning a human deterrent into a beneficial resource is a clear instance of this adaptive behavior.

Conclusion

In their creative use of anti-bird spikes, magpies and crows have provided a fascinating case study of avian ingenuity. They’ve turned a human-made deterrent into an advantageous resource, demonstrating their intelligence and adaptability. These observations could have significant implications for how we design bird deterrents in the future. It also invites us to appreciate and respect the remarkable cognitive capabilities of these feathered urban dwellers.

— WTF fun facts

Source: “Magpies Are Making Nests Out Of Humans’ “Anti-Bird” Spikes” — IFL Science

WTF Fun Fact 13453 – Shark GPS Tracker Draws Shark

A great white shark with a GPS tracker drew a shark in the waters off the eastern coast of North America. Was he “punking” researchers? Telling us he knows what we’re up to? Do sharks mysteriously swim in shark-shaped patterns? Or are we just seeing what we want to see?

Don’t answer that – it’s not as funny if you do.

The unconventional artist

Art and creativity are typically deemed human endeavors. But perhaps they also belong to the great white shark who unwittingly sketched a self-portrait, using tracking data as its brush.

Our artist is a mature male great white shark, named Breton by the OCEARCH team. He’s a frequent wanderer off the Atlantic Ocean coast of Long Island, New York. As part of the shark tracking initiative, he carries a tracker affixed to his dorsal fin. This tracker collects and relays data whenever the shark surfaces, providing an almost real-time map of the shark’s movement.

Did the shark GPS tracker draw a shark?

A May 2022 observation of Breton’s tracking data offered an unexpected delight to the researchers. It seemed as though Breton had swum in a pattern that mirrored the outline of a great white shark when seen from above.

OCEARCH shared the data on its social media, and the internet quickly took notice.

The tracking path captured not only the body’s curve but also the classic angular shape of the tail and the pectoral fins. It sure looks like a shark!

Coincidence or Design?

As fascinating as Breton’s journey may seem, it is essential to underline that the ‘self-portrait’ was purely coincidental. Sharks navigate based on instincts and sensory information, not a predetermined design. Sorry if you needed to be told that – but people have been studying sharks for a long time. That doesn’t mean we can’t enjoy the coincidence!

While the artistic byproduct is captivating, the primary purpose of tracking sharks like Breton is conservation. By learning about migration patterns, feeding areas, and breeding grounds, scientists can devise effective strategies to safeguard these creatures. The knowledge gained from such tracking can inform the establishment of marine protected areas and fishing regulations.

The good news is that Breton’s self-portrait can serve as a symbol for raising awareness about the threats facing great white sharks.

Issues like overfishing, habitat degradation, and climate change pose significant threats to these magnificent creatures. Breton’s story is an opportunity to engage the public and rally support for shark conservation.

— WTF fun facts

Source: “Great White Shark Accidentally Draws Self-Portrait With Tracking Path” — The Inertia

WTF Fun Fact 13443 – Dead Fruit Flies

When fruit flies see or smell their dead comrades, their own lives are cut short. Talk about putting a damper on your day!

Fruit flies stress after seeing other dead fruit flies

If you’re a fruit fly, seeing one of your fallen is not just unsettling. It’s downright harmful to your health. Despite their diminutive size, experience stress and negative health effects when they witness the remains of their kin.

Neuroscientists have found that when fruit flies (Drosophila melanogaster) see their deceased fellow flies, specific brain cells are triggered.

And these aren’t just any brain cells. They are neurons that respond to visual stimuli, known as visual projection neurons (VPNs). These cells relay information from the flies’ eyes to their brains, helping them interpret and react to what they see.

What’s going on in a fruit fly’s brain?

But let’s add a pinch of intrigue to the mix. These neuroscientists didn’t stop at merely identifying the type of neurons involved. They zeroed in on the specific group of neurons that reacts to the sight of dead flies. The neurons in question are part of a cluster known as the “globus pallidus.” This is an area associated with movement and learning.

These scientists have discovered the precise neighborhood in the fruit fly’s brain where the “dead fly sighting stress response” takes place.

So, what happens when these neurons fire? In short, they trigger a series of stress responses that have a tangible impact on the fruit flies’ health and lifespan. As the sight of a dead fellow fly becomes ingrained in the fly’s brain, it alters the expression of stress-related genes, tipping the physiological balance and leading to a shorter lifespan.

This discovery has raised intriguing questions about the evolution of empathy and social responses in insects. While fruit flies may not experience empathy in the way humans do, their stress response to seeing dead comrades suggests a level of social awareness. This raises the question: why would such a response evolve? One possibility is that the sight of death serves as a warning signal, indicating the presence of potential threats or diseases, thus prompting the fly to modify its behavior.

However, this remarkable finding does more than just throw light on fruit flies’ stress responses. It could also contribute to our understanding of how human brains process stress and trauma. Humans, like fruit flies, have neurons that respond to visual stimuli. Therefore, these findings could lead to a better understanding of how our brains respond to stressful visual experiences, and potentially inform treatments for stress-related disorders.

— WTF fun facts

Source: “Seeing dead fruit flies is bad for the health of fruit flies – and neuroscientists have identified the exact brain cells responsible” — The Conversation

WTF Fun Fact 13439 – The Dog Days of Summer Explained


Does the phrase “Dog Days of Summer” conjure images of lethargic canines lazing in the heat? Well, the origins of this term reach far beyond our four-legged friends and into space.

What are the dog days of summer?

Ok, technically, it does have to do with a dog – Sirius, the Dog Star. Sirius is part of the constellation Canis Major, and it’s the brightest star in the Earth’s night sky.

The term “Dog Days” stems from the ancients, both Greeks and Romans, who noticed the coincidence of the hottest time of the year with the period when Sirius rose and set with the Sun. They hypothesized that the added radiance of Sirius was the cause of the intensified summer heat. Thus the phrase “Dog Days” in reference to Sirius’s constellation.

But the “Dog Days” are more than just a celestial phenomenon and a synonym for summer swelter. They have cultural and historical significance dating back thousands of years. The Greeks, for instance, saw the period as a time of potential disaster, heralding fever, catastrophe, and even the downfall of empires.

Wobbling dog days

Fast forward to the present, and the “Dog Days” still persist in our lexicon. However, due to a phenomenon called precession (the slow wobble of Earth’s rotational axis), the dates during which Sirius rises and sets with the Sun have slowly shifted over centuries. Yet, the phrase “Dog Days” remains tethered to the heart of the summer. It’s recognized in the Northern Hemisphere primarily from July 3 to August 11.

The warmest days of summer, those long afternoons that stretch languidly towards the evening, are connected to a distant cosmic spectacle occurring about 8.6 light-years away. That is the beauty of astronomy and the power of human observation, linking us to the stars and the seasons in unexpected ways.

So, next time you’re feeling the heat of summer bearing down, spare a thought for Sirius and its ancient connection to these sultry days. The “Dog Days” are a cosmic link, a reminder that even on the hottest days of summer, we are all under the same sky.

— WTF fun facts

Source: “Stars and canines collide in ‘dog days’” — Christian Science Monitor

WTF Fun Fact 13438 – Killer Whales are Dolphins

Here’s a bit of trivia that might just turn your marine world upside down: killer whales, also known as orcas, aren’t whales. They’re actually the largest dolphins in the sea! That’s right, Shamu, the poster child for what we envision when we think of whales, is really more Flipper than Moby Dick.

Are orcas whales or dolphins?

Orcas, known for their black bodies, striking white patches, and formidable size, are a sight to behold. However, despite their common name – killer “whale” – these majestic creatures are more closely related to their smaller, playful dolphin cousins.

Now, this might seem like a marine biologist trying to mess with you, but it’s all in the scientific classification. Orcas are part of the oceanic dolphin family, known as Delphinidae, which includes other well-known species like the bottlenose dolphin and the common dolphin. Essentially, all killer whales are dolphins, but not all dolphins are killer whales.

In fact, the orca’s scientific name, Orcinus orca, loosely translates to ‘demon from hell’, a nod to their reputation as fierce hunters. But don’t let the ominous name scare you, these creatures are incredibly intelligent and social.

Orcas, like their dolphin relatives, are known for their intelligence and complex social structures. They live in tight-knit groups known as pods, led by a matriarch, often the oldest female. Within these pods, they communicate using a series of clicks, whistles, and body movements.

What’s fascinating about orcas is that different pods can have different cultures, dialects, hunting techniques, and even dietary preferences. This level of cultural diversity is virtually unheard of outside of human societies, further cementing their place in the pantheon of intelligent life on Earth.

Classifying creatures

However, their classification as dolphins doesn’t make them any less ‘killer’. They are apex predators, the top of the food chain, preying on seals, fish, squid, and even other whales. Their name, ‘killer whale’, is actually a bit of a misnomer. It originates from the term ‘whale killer’, coined by sailors who observed these dolphins attacking larger whales.

Despite being top predators, orcas face a host of challenges in the modern world, ranging from pollution and loss of prey to climate change and captivity. Our understanding of orcas, their behaviors, and their needs, is crucial for their protection.

Perhaps one of the best ways we can appreciate orcas is to realize that they’re not so different from us. They’re intelligent, they’re social, they’re diverse, and they’re vulnerable. They’re dolphins that have adapted to their environment in remarkable ways, rising to the top of the oceanic food chain.

So next time you hear the term “killer whale”, remember, these magnificent creatures are actually the ocean’s largest dolphins. Just another example of how the natural world continues to surprise and inspire us!

— WTF fun facts

Source: “Is an orca (killer whale) a whale or a dolphin?” — WDC

WTF Fun Fact 13437 – Nuclear Pasta

Luckily, nuclear pasta is not coming to a dinner plate near you.

Imagine the densest material in the universe. It’s far harder than a diamond. In fact, this stuff is ten billion times stronger. Nestled in the heart of a neutron star, there’s a material that goes by the name: nuclear pasta.

Why is it called nuclear pasta?

Welcome to the most outlandish, mind-boggling part of astrophysics. Neutron stars, the remnants of massive stars that exploded as supernovae, pack twice the mass of our sun into a sphere just 20 kilometers in diameter. As a result, these objects have some truly wild properties.

If you were to dig into the heart of a neutron star, you’d see layers of complexity. As you delve deeper, things get denser and denser. Around halfway to the center, the density of the material becomes so great that the atomic nuclei become squished into a variety of shapes. Scientists believe they resemble pasta types, hence the nickname.

But what makes this stuff special?

According to research, these are likely the densest and hardest substances in the universe. In fact, one sugar cube of nuclear pasta would weigh as much as a mountain.

Theoretical physicists and astrophysicists have been trying to simulate nuclear pasta to better understand its properties. According to a 2018 study, nuclear pasta may be the strongest material in the universe. It’s not only incredibly dense but also has a shearing resistance tougher than steel’s.

This immense density results in intense gravitational fields, causing the pasta shapes to align themselves into an incredibly tight lattice structure. This structure could play a crucial role in various neutron star phenomena, including starquakes, glitches, and even gravitational waves.

Interestingly, nuclear pasta doesn’t exist naturally on Earth, and for a good reason – it’s way too dense and strong for our environment. But the fact that it exists in the universe opens up a whole new realm of physics.

Discovering the existence of nuclear pasta is also vital for understanding neutron stars better. These stars are not only fascinating in their own right but also play a crucial role in the life cycles of galaxies. Understanding more about neutron stars could, therefore, lead to insights about how galaxies, including our own Milky Way, evolve over time.

There’s still so much to learn about neutron stars. But one thing’s for sure – the universe is full of fantastic and surprising structures!

— WTF fun facts

Source: “What is nuclear pasta?” — BBC Sky at Night Magazine

WTF Fun Fact 13436 – Vertical Forests

Do you know about the urban jungles called vertical forests? These towers of lush greenery stretch skyward, a testament to man’s ingenuity and nature’s adaptability.

The original vertical forest – Bosco Verticale

Vertical forests stem from the inventive mind of Italian architect Stefano Boeri. His vision for a greener planet led to the creation of Bosco Verticale, a pair of residential towers in Milan. These living, breathing structures showcase over 900 trees, 5,000 shrubs, and 11,000 floral plants. The foliage acts as an urban lung, absorbing carbon dioxide and pumping out oxygen, offering a breath of fresh air in a bustling metropolis.

Vertical forests in Asia

Hot on Milan’s heels, Nanjing, China, unveiled its vertical forest concept in 2018. Nanjing Green Towers mirror their Italian counterparts, cocooning a hotel, office, museum, school, and a rooftop club in a verdant embrace. Greenery cloaks the buildings, forming a dynamic ecosystem that provides shade, reduces noise pollution, and creates a habitat for birds and insects.

Across the globe in Ho Chi Minh City, Vietnam, Vo Trong Nghia Architects has a vision. With the city’s greenspace dwindling, they proposed a series of condominiums swathed in bamboo-filled concrete planters. They’ve named it the “House for Trees,” with each building designed to accommodate a tree on its roof.

A burgeoning trend

But, vertical forests aren’t solely for the concrete giants of the world. Medium-sized cities have jumped on the bandwagon too, with Eindhoven, a quaint city in the Netherlands, unveiling its own verdant vision. Trudo Vertical Forest is an affordable housing project designed to provide low-income families with sustainable homes wrapped in the embrace of 125 mature trees and countless shrubs.

In Quito, Ecuador, the urban jungle takes a different form. The IQON is Latin America’s first vertical forest, with plans to feature over 300 tree species, some of which are in danger of extinction. It’s an ambitious project, and one that aims to reconcile the city with its biodiverse surroundings.

Finally, let’s take a trip to the desert. In the heart of Egypt’s New Administrative Capital, Stefano Boeri strikes again. He proposes a series of seven vertical forest buildings and three green residential complexes. The design aims to combat desertification while creating a bio-diverse urban ecosystem.

These are just a few examples of the burgeoning trend of vertical forests, a unique solution to urbanization’s challenges. As the world’s cities continue to expand, it’s this kind of innovative, nature-centric architecture that will help keep our urban environments breathable, sustainable, and beautiful.

— WTF fun facts

Source: “9 Vertical Forests Around the World That Look like Jungles in the City” — Interesting Engineering