Dude you’re completely totally wrong about Pandas.

Pandas only have fertility issues in captivity. Everything you described just now ONLY applies to pandas living in captivity

They do just fine in the wild. At least, they

The reason for their falling population numbers is their loss of habitat.

And if I remember correctly they have one cub every two years, overall low rate of reproduction but that has more reproductive strategy than anything else.

Suffice to say: pandas reproduce much more successfully in the wild than previously thought