Birds heron water flight animals. Birds also known as aves or avian dinosaurs are a group of endothermic vertebrates characterised by feathers toothless beaked jaws the laying of hard shelled eggs a high metabolic rate a four chambered heart and a strong yet lightweight skeletonbirds live worldwide and range in size from the 5 cm 2 in bee hummingbird to the 275 m 9 ft ostrich. An additional 19 species have been added from igoterra through august 2019. This is a list of the bird species recorded in namibiathe avifauna of namibia included a total of 676 confirmed species as of may 31 2017 according to the namibia bird records committee nbrc. Brown birds include sparrows emus thrushes larks eagles falcons and the female birds of many species such as wrens ducks blackbirds and peacockswhen a brown bird is in long grass or among tree trunks or rocks it is camouflaged.
Many birds are brown green or grey.