Feathered, warm-blooded vertebrates with wings and lightweight bones, most of which fly.
Feathers, beaks without teeth, hollow bones, high metabolic rate, four-chambered heart and efficient one-way airflow through lungs and air sacs. Birds are living dinosaurs (theropods).
Birds have a high metabolic rate and lay hard-shelled eggs. Courtship songs and displays are well developed. Beak shapes reflect diet.
Remember: birds are a surviving dinosaur lineage.
Feathered, warm-blooded vertebrates with wings and lightweight bones, most of which fly.
Birds is one of the 53 topics in Zoology & Animal Diversity. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Bird Flight Adaptations, Mammals, Reptiles.
Hummingbirds hover with figure-eight wing motion.
Birds is a Beginner topic, so no earlier topic is required. Other Beginner topics in Zoology & Animal Diversity that pair well with it include Animal Kingdom, Vertebrates and Invertebrates, Sponges.
The closest topics to Birds are Bird Flight Adaptations, Mammals, Reptiles, Hibernation and Torpor. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Birds. To practise the whole of Zoology & Animal Diversity, use the Zoology & Animal Diversity quiz.
Birds: Feathered, warm-blooded vertebrates with wings and lightweight bones, most of which fly. Bird Flight Adaptations: Hollow bones, keel, air sacs and feathers combine to deliver lift and efficient respiration. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Bird Flight Adaptations and explain the difference aloud. Finally, take the Zoology & Animal Diversity quiz and come back to this page for any question you miss.
Hollow bones, keel, air sacs and feathers combine to deliver lift and efficient respiration.
🦁 Zoology & Animal DiversityWarm-blooded vertebrates with hair that nourish their young with milk.
🦁 Zoology & Animal DiversityScaly, ectothermic vertebrates that lay shelled eggs on land, including snakes, lizards and turtles.
🦁 Zoology & Animal DiversityReduced metabolism and body temperature allow animals to survive scarce winter food.
🦁 Zoology & Animal Diversity