Such hybrids are called tions and ligers. Do they challenge the definition of species? Not really. The key words are "interbreed successfully"; tigons and ligers generally are sterile and short ...

In general, the tigon is much smaller than the liger. Pizzly bears – also called Grolar bears – are created by interbreeding ...

A liger — which is a "ligre" in Spanish — is a hybrid offspring of a male lion and a tigress, a female tiger. A tigon is the ...

A zebra and horse hybrid. Zorses usually have a horse's body with zebra-like stripes. A hybrid between domestic cattle and American bison (buffalo). Beefalo are bred to combine the hardiness of bison ...