Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) common ostrich. There are over 11,000 living species and they are split into 44 orders. More than …

Jan 24, 2026 · Bird, any of the approximately 11,200 living species unique in having feathers, the major characteristic that distinguishes them from other animals. They are warm-blooded vertebrates more …

Oct 25, 2025 · Explore how birds evolved, what they eat, and how they live. From flightless penguins to speedy falcons, discover the beauty of avian life.

Birds are found worldwide and in all habitats. The largest is the nine-foot-tall ostrich. The smallest is the two-inch-long bee hummingbird. Everything about the anatomy of a bird reflects its...

May 24, 2019 · Discover the main types of birds, from common groupings like birds of prey and water birds to the 40 scientific bird orders. Explore examples, classification, and bird diversity worldwide.

May 6, 2025 · Birds are warm-blooded vertebrates characterized by feathers on their bodies, toothless beaked jaws, hard-shelled calcareous eggs, and a four-chambered heart with a high rate of metabolism.

Sep 24, 2025 · What are birds? Explore the definition, classification, characteristics, behaviors, and fascinating facts about birds, from songbirds to raptors, in this complete guide

Apr 2, 2024 · Birds are a group of warm-blooded, feathered vertebrates that lack teeth and lay hard-shelled eggs. They live in nearly every environment, from the polar regions to the tropics. Most birds …

Birds are the only animals that have feathers, and are warm-blooded vertebrates. While all birds boast wings, not all have the power to fly (such as ostriches and penguins).

Jan 6, 2018 · On this page you’ll find out all about birds, including how they evolved and what makes a bird a bird. Random bird fact: the world’s most common wild bird is the red-billed quelea.