White Swan with nest and eggs. Wanganui New Zealand
Vegetation survey of Pengxi River drawdown zone; Day 3 T3; "heron"; 175 m; near Gaoyang
Seen at Stow Lake
Gaoyang edge of town
Birds (class Aves or clade Avialae) are feathered, winged, two-legged, warm-blooded, egg-laying vertebrates. Aves ranks as the tetrapod class with the most living species, approximately ten thousand. Extant birds belong to the subclass Neornithes, living worldwide and ranging in size from the 5 cm (2 in) Bee Hummingbird to the 2.75 m (9 ft) Ostrich. The fossil record indicates that birds emerged within the theropod dinosaurs during the Jurassic period, around 150 million years ago. Birds are the only living...