Birds are the only animals with feathers, which are uniquely designed for flight.
The smallest bird in the world is the bee hummingbird, which is just over two inches long and weighs less than a penny.
The largest bird in the world is the ostrich, which can grow up to 9 feet tall and weigh over 300 pounds.
Penguins are flightless birds that spend half their lives on land and half in the ocean.
Birds have excellent eyesight and can see in color, ultraviolet light, and have the ability to focus on both near and distant objects.
Migratory birds travel thousands of miles every year to reach their breeding grounds and wintering grounds.
Birds have a unique respiratory system that allows them to extract more oxygen from the air than other animals, which is essential for their high energy needs during flight.
Many birds are known for their unique songs and calls, which they use for communication and to attract mates.
Some birds, like the Arctic tern, have the longest migrations of any animal, traveling up to 44,000 miles round-trip every year.
Many bird species are monogamous, forming long-term pair bonds with their mates.
Many birds are important pollinators, spreading pollen as they feed on flowers and fruit