(Sample link) White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
National Wildlife Federation http://www.nwf.org
Coloring Pages http://www.kidzone.ws/
Practice worksheets/Math and Language Arts http://www.abcteach.com
Activity pages http://www.dltk-teach.com