2. Tigon Tigon is an animal resulting from a cross between a male tiger and a female lion. They are smaller than ligers and often resemble their lion parent in appearance, with faint tiger stripes.

Do they challenge the definition of species? Not really. The key words are "interbreed successfully"; tigons and ligers generally are sterile and short-lived -- an evolutionary dead end.

You can read more about ligers here. Nobody could fault you for thinking a tigon should basically be the exact same animal as ...

It is a scene many wildlife experts never thought they would see. Two beautiful tigon cubs rest with their mother - blissfully unaware that they are making history by living for 205 days.