How do nocturnal animals get the sunlight they need to make vitamin D?
Most animals produce vitamin ‘D’ and vitamin ‘C’ within their own systems. We “naked apes” got the short end of that adaptation mechanism. We have to have sun on the skin or foods that have ‘D’ in abundance, which is, interestingly, sea food. There are others in the plant world, but it takes a great deal of those plants to provide adequate amounts for good bone growth in children. Humans may have become “hairless” primates because of the need for ‘D’ that their primarily meat diet did not provide when they went out onto the savannahs and became hunters.
