Grade 5 Science

Seasons
Seasons Interactive
Seasons Interactive Simulations
Earth's Tilt 1: The Reason for the Seasons - YouTube

Solar System
StarDate | Your guide to the universe
Amazing Space
StarChild: The Solar System
Suntrek
Solar System Exploration: : Planets 
NASA 
Motions of the Sun Simulator - Motions of the Sun - NAAP
Ask an Astronomer | Cool Cosmos
Astronomy for Kids | Astronomy.com
Rader's COSMOS4KIDS.COM

Environment
Endangered Species Criteria and Definition
Acid Rain Students Site: What is acid rain?
A Student's Guide to Global Climate Change | US EPA

Birds
Birds - Bird Skull Collection 
Lab of Ornithology - YouTube
Find a Bird
Watch Bird Videos of Your Favorite Backyard Birds
ML: Macaulay Library of bird videos and sounds
Your online guide to birds and bird watching
Celebrate Urban Birds

Project Beak: Adaptations
Facts About Birds - National Zoo| FONZ

John James Audubon's Birds of America | Audubon
Birds | Audubon
Bird Migration Game - Smithsonian Migratory Bird Center 
All About Feathers | All About Bird Biology * The Cornell Lab
Bird Song Hero

Optics
Light & Dark - Sources & Reflections - Science Games & Activities for Kids
How We See - Light & Mirror Game - Science Activities for Kids 
Optics for Kids - What is Light, Light Optics
BBC - KS3 Bitesize Science - Energy transfer and storage 
Disappearing Color Wheel - Sick Science! #182 - YouTube
Physiology of the Eye - YouTube
Light and Optics for Kids - Science Games and Videos
SloMo Science: Laser Balloon - Science360 - Video Library - light's energy
Energy and kids
Tour of the EMS 01 - Introduction - YouTube
Physics4Kids.com: Light & Optics: Introduction
Optics For Kids - The Optical Society: Exploring the Science of Light