an albatross soars gracefully through the boundless expanse of the sky

bird birds feathers feather wings beak hollow bones respiratory system heart brain eyes ears talons legs feet digestive reproductive cloaca warm-blooded vertebrates lightweight adaptable migratory vocalizations courtship displays cooperative breeding communal roosting social behaviors predators herbivores opportunistic feeders sexual reproduction eggs incubation monogamous pairs breeding systems parental care animal nature wildlife wild zoo flight fly outstretched majestic albatross aerial elegance