#DYK why blue footed booby’s have blue feet?💙
Scientists have discovered that the blue color of the booby’s feet is the result of carotenoid pigments obtained from its fish diet. These carotenoids have an antioxidant effect and are thought to stimulate the bird’s immune function. The blue pigmentation is therefore a reliable indication of the bird’s overall health, namely its immunological state and level of nourishment. This is a good explanation for why females are attracted by the blue coloration. In fact, it’s highly likely that the female’s preference for blue feet has evolved the species to its current state of especially bright blue feet!