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: The Transforming Leap, From Four Legs to Two
John Noble Wilford, a "New York Times" science writer, outlines various hypotheses on the origin of bipedalism.
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: Early Tetrapod Fossils
In this transcript of an interview filmed for the PBS series "Evolution," scientists Ted Daeschler and Neil Shubin describe the discovery and significance of some of their key fossil finds.