PBS
Idaho Ptv: Predators
A comprehensive resource on the topic of predators. Includes half-hour video, facts, links, a reading list, resources for teachers, and a glossary, While there are links to videos, they may no longer work.
Science Struck
Science Struck: Symbiotic Relationships in the Deciduous Forest
Explains what a symbiotic relationship is, the five main types of symbiosis, and provides examples of symbiotic relationships among living things in a deciduous forest.
Biology 4 kids
Biology4 Kids: Relationships Between Organisms
Species interact every day. That interaction is a vital part of how organisms develop and change over time. When you study species, it is important to watch the way they interact with their surroundings. There are four basic types of...