Except once again you never do your research.
Ligers are Sterile? Definitely Not!
And you might look up
li-ligers.
So before you talk about failures you should gaze long into the mirror and admit your own since they are deffinately producing fertile offspring. So again we just have the incorrect classification of infraspecific taxa as separate species.
And I am still waiting for the list of those infraspecific taxa in the fossil record.
Did you think you could get out of that by attempting to change the subject?
You made the same error that you did last time. You found a bogus post that thinks in the same errant all or nothing terms that you do. The fertility of Tigons and Ligers is greatly reduced. I did not say sterile.
See if you can find a valid source that says that they are not of greatly reduced fertility, otherwise simple sources such as Wikipedia are far better than the lame source that you used:
Tigon - Wikipedia
Liger - Wikipedia
"The fertility of hybrid big cat females is well documented across a number of different hybrids. This is in accordance with
Haldane's rule: in hybrids of animals whose sex is determined by
sex chromosomes, if one sex is absent, rare or sterile, it is the heterogametic sex (the one with two different sex chromosomes e.g.
X and
Y).
According to
Wild Cats of the World (1975) by C. A. W. Guggisberg, ligers and tigons were long thought to be sterile: in 1943, a fifteen-year-old hybrid between a lion and an 'Island' tiger was successfully mated with a lion at the
Munich Hellabrunn Zoo. The female cub, though of delicate health, was raised to adulthood.
[18]"
Please note, it points out that the fertility was so reduced that they were thought to be sterile. Reduced sterility of that degree is enough to demonstrate that they are different species. You can't make up your own definitions every time that you are shown to be wrong.
In September 2012, the Russian Novosibirsk Zoo announced the birth of a "
liliger", which is the offspring of a liger mother and a lion father. The cub was named Kiara.
[19]