Leonardo Da Vinci used to buy caged animals at the market just to set them free.
A man rescued a dying crocodile, looked after it, tried to release the croc into the wild, but the croc kept coming back. The two became ‘best friends’ and for the next 20 years, Chito (man) used to get into the water to swim, kiss, hug, play with ‘Pocho’ the 5-meter, 450kg croc.
Congo, a chimpanzee who made over 400 paintings, would scream if a painting was taken away from him before he was finished.
Herodotus wrote about fuzzy, dog sized ants living in India which dug up gold to build ant hills. For centuries, people assumed it was made up. In the 1990s, scientist discovered a fuzzy marmot living in India that digs up gold whenever it burrows.
A Japanese zoo unsuccessfully tried to mate a pair of hyenas for four years before realizing both were males.
The Soviet Union attempted to domesticate moose for use in a cavalry.
Reintroducing wolves to Yellowstone changed the entire geography of the park: as elk were displaced, saplings that would have been eaten by elk were spared, riverbank erosion was brought under control, and streams and rivers shifted their courses.
In an experiment where a kitten was raised in the same cage as a rat, the cat not only refrained from attacking the rat, but the two became close companions, and the cat refused to chase or kill any other rats as well.