Meet the world’s largest feline: the liger. While ligers are certainly something to marvel at, you’ll never found one outside of a zoo—they’re a man-made hybrid cross between a male lion ...

Yet when they are brought together artificially, they can interbreed. Such hybrids are called tions and ligers. Do they challenge the definition of species? Not really. The key words are ...

A species is a group of organisms that interbreed to produce fertile offspring. Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.