There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
Male animals that lose their testes often go through metabolic and lifestyle changes that makes them become fat. So that explains Caesars case.
For the lioness its a bit less clear as we don't know if something is triggering it. She may just be a lioness that was a bit stronger than the others. So able to compete more to get better meals and seek out bigger prey. Which would train her to gain more muscles. The infertility is just a coincidence as its not too rare in lions in the first place.
But a hormonal issue would also explain it. Though she is lacking the tell-tale mane growth in such case.