General Science Sites
National Geographic for Kids

Animals
ABC Education: Animals
Animal Fact Guide
Cincinnati Home Safari Videos
Defenders: Wildlife
National Geographic for Kids: Animals
National Wildlife Federation
San Diego Zoo for Kids
Science Kids: Animals
Smithsonian National Zoo
SoftSchools
Switch Zoo
ZooBorns

Food Chains
Video: Food Chain, Food Web, Energy Pyramids
Video: Energy Pyramid
Video: What is a Food Chain?

Health
CATCH: Health at Home

Planets
NASA Solar System Exploration
Science for Kids Planet Facts
National Geographic for Kids: Solar System