Two australian pied cormorant, phalacrocorax varius standing side by side, one preening and grooming its wing feathers, the other sleeping by tucking its beak into the back feathers to conserve energy

preen beak waterbird wildlife birdwatching birding bird phalacrocorax perch ornithology shag roost plumage waterfowl australia zoo pelican cormorant habitat wing species animal head pied wetland nature stand environment rock new zealand wild groom natural coast conserve energy varius australasia australian sleep coastal rest great keep warm tuck bill clean feather back nightfall