PBS
Pbs Learning Media: Shape of Trees: The Frustration Principle
This series of images shows the work of biologist Karl Niklas on the adaptations and evolution of plants. From The Evolutionary Biology of Plants.
PBS
Pbs Learning Media: Bird Food and Bird Beaks
There are almost as many types of bird beaks as there are types of food that birds like to eat. This collection of images shows a wide range of beaks and the types of foods handled by each.
PBS
Pbs Learning Media: Colorful Creatures
For animals, bright, flashy coloration can serve as a warning or as an invitation. Either way, colorful skin, feathers, and scales yell, "Notice me!" This collection of images shows examples of some of the world's most colorful creatures.
PBS
Pbs Learning Media: Bird Beak Gallery
This collection of images of ten different birds illustrates the diversity of bird beaks.
PBS
Pbs Learning Media: How the Woodpecker Avoids a Headache
This diagram from Rainbird Publishing describes the specialized physical characteristics that allow woodpeckers to create some of the most secure nests in the bird world.
PBS
Pbs Learning Media: Mimicry: The Orchid and the Bee
In this photograph from Oxford Scientific Films, a horned bee attempts to mate with an Ophrys orchid, which has evolved to resemble a female bee.
Smithsonian Institution
Smithsonian National Zoo: Bird Bill Matching Game
Can you identify the purpose of different bird beaks? Read up about the different types of beaks and then you'll apply your knowledge by identifying the purpose of different shaped beaks.
American Museum of Natural History
American Museum of Natural History: Dinosaurs: Display or Defense?
Are plates of armor, horns, exceptionally large heads, and bony plates examples of dinosaur display or defense? Visitors to this resource will learn what scientists have concluded about the purpose of these peculiar dinosaur features.