Birds of the World

What’s inside

• Which structure is a defining feature of all living birds?
• Which bird is the largest living bird by height and mass?
• What is the main aerodynamic advantage of an albatross's long, narrow wings?
• Which bird is especially known for chicks that use claws on their wings to climb trees?
• Which adaptation most directly helps a woodpecker avoid brain injury while repeatedly striking tree trunks?
• Which feature most directly helps penguins remain warm in cold water?
• All living bird species are capable of powered flight.
• Hummingbirds can hover by rapidly beating their wings and producing lift during both the downstroke and upstroke.