Darwin Bay is a nesting spot for many marine birds. Puffball chicks of Great frigate birds and their proud papas crowd the surrounding branches, while yellow-crowned herons and lava herons feed by the shore.  Watch your step for marine iguanas, lava lizards and Galapagos doves that blend with the trail. Swallow-tailed gulls, the only nocturnal gulls in the world, can be seen nesting at the cliff’s edge. Lava gulls and pintail ducks ride the sea breezes nearby.