(ELI5)How do animals that have strict diets of certain foods not end up with certain vitamin deficiencies like humans develop ?

Question

Humans have to maintain well balanced diets or they can develop vitamin deficiencies of certain vitamins and minerals, why does this not seem to be true for animals ?

In: Biology

Answer 1

Many animals synthesize vitamins that they need, just like humans synthesize Vitamin D using sunlight.