成人快手

Great frigate birds need to collect twigs for nest building but their large wings and short legs make it difficult for them to land, so they prefer to collect their nest-building material on the wing. Boobies can settle and break off the branches they need for their nest. Frigates can't, so they steal from the boobies. For the boobies, getting the materials to their nest is the most difficult part of nest building as they come under attack from the frigates.