There are tiny insects called spittlebugs that create foamy bubbles on a plant which insulate them from heat and cold, keep them moisturized, and hide them from predators. – WTF Fun Facts
WTF Fun Fact – Spittlebug Foam

There are tiny insects called spittlebugs that create foamy bubbles on a plant which insulate them from heat and cold, keep them moisturized, and hide them from predators. – WTF Fun Facts