Life - Birds
Birds (class aves) is a group of vertebrates that is evolutionary very close to the reptiles. Birds, however, are warm-blooded and most have the ability to fly thanks to their feathers. One of the major focuses in this episode is the incredibly complex courtship behavior exhibited by some birds and how it relates to their evolution.
Species: Spatuletail hummingbird, lammergeier, red-billed tropicbird, red knot, lesser flamingo, chinstrap penguin, great white pelican, Clark's grebe, sage grouse, vogelkop bowerbird.
Answer Key: Available as part of the Life Answer Key Collection for $8.00.