DISCOVERY OF MACRO WONDERS GETTING CLOSEUP AND PERSONAL WITH THE MYSTERY OF THE SMALL WORLD. LEARN MORE Macro Photo Conference - Mike Moats 2-day Hands-on Marco Photography Workshop LEARN MORE
Birds, are a group of endothermic vertebrates, characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known as perching birds.