Ethology, Animal morphology, Animal nesting, Bird nesting, Molecular genetics, Zoology, Animal anatomy, Biology, Habitat selection, Eggs, Tarsus, Connective tissues, Animal reproduction, Limb bones, Genetics, Bones, Sandpipers, Ovipary, Animal physiology, Mating behavior, Waterfowl, Breeding, Male animals, Birds, Animal wings, Behavioral sciences, Animal soc...