[Free Registration/Login may be required to access all resource tools.] Amphibians are a group of vertebrates that have adapted to live in both water and on land. Amphibian larvae are born and live in water, and they breathe using gills....

[Free Registration/Login may be required to access all resource tools.] There is an amazingly wide variety of birds. Birds are vertebrates. Almost all have forelimbs modified as wings, but not all birds can fly. Learn more about birds in...

[Free Registration/Login may be required to access all resource tools.] Did you know that fish, amphibians, reptiles, birds, and mammals are all related? They are all chordates. Chordates are a group of animals that includes vertebrates,...

Erin Eastwood details the surprising "back from the dead" discovery of the coelacanth and explains how this fish's fins shed light on the evolutionary movement of vertebrates from water to land. [4:17]

[Free Registration/Login may be required to access all resource tools.] Provides an overview of the organisms living in the sea.

Explore the characteristics and behaviors of amphibians.

Explore the behaviors, characteristics, and diversity of chordates.

[Free Registration/Login may be required to access all resource tools.] Overview of the characteristics and classification of chordates.

[Free Registration/Login may be required to access all resource tools.] Describes how mammals maintain their body temperature.

[Free Registration/Login may be required to access all resource tools.] Covers the characteristics and traits of mammals.

[Free Registration/Login Required] This is a lesson on classifying invertebrates based on their observable features. It focuses on the three types of worms: flatworm, roundworm, and segmented worm. The lesson contains 3 videos as well as...

This site contains several pictures of vertebrate fossils. The text would be too difficult for elementary school but the pictures of the vertebrates could be used to supplement the lesson plan.

This site contains several pictures of vertebrate fossils. The text would be too difficult for elementary school but the pictures of the vertebrates could be used to supplement the lesson plan.