keystone species

The pygmy hog is the world’s tiniest wild pig at 10″ tall and is the keystone species of the Terai grasslands in North India. It was once thought extinct but now several hundred are roaming wild. – WTF Fun Facts

Source: World’s Tiniest Pig at 10-Inches Tall, Once Thought Extinct, Is Returning to the Wild (goodnewsnetwork.org)