[spetznaz]

Most are infertile .....apart from the offspring of tigers and lions. Tigers and lions are basically so similar that their offspring are able to reproduce (eg a lion can mate with a tiger to give a tigon ....and then the tigon can mate with a tiger to give a ti-tigon, and so forth). It is virtually impossible to tell the difference between a lion and a tiger once you remove the hide.

[gd124]

It would be good if ligers could mate with ligers producing fertile offspring - that would be interesting