Here's the link to the Armand Bayou nature Center. It's beautiful. Plan a trip out there one weekend. Very affordable and lots of fun. Here's another place you may like to visit. The Houston Arboretum and Nature Center.
Here are a couple of websites that provide some very nice animations on the carbon and nitrogen cycles. Hope you enjoy.Carbon Cycle
http://epa.gov/climatechange/kids/carbon_cycle_version2.html
Nitrogen Cycle
http://www.ext.vt.edu/resources/4h/virtualfarm/flash_mov/nitrogencycleintro.swf

Here are a couple of websites for you. The first is a game (of course). How quickly can you match adaptation to animal? Let me know your high score.
http://www.ecokidsonline.com/pub/eco_info/topics/climate/adaptations/index.cfm
This next one is a slide show covering everything related to Ecology. Don't know what that is? Check out the site and find out. Enjoy.
Check this site for additional information on complete and incomplete metamorphosis. There are also lots of wonderful pictures (at the bottom of the page). Enjoy.http://www.uen.org/utahlink/activities/view_activity.cgi?activity_id=2024