Great resource for teachers. Lots of information, maps, lesson plans, and help for teachers to create the most up to date lesson plans on habitats.
This companion web site to the popular PBS series NATURE has teacher guides available with numerous lesson plans and activities for teaching about the world around us.
National Wildlife Federation
Build a habitat at your school.
Habitats and Food Chains
A look at why animals live where they do.
Niche and Habitat (.pdf)
A chapter from a University of California document for teachers to read and learn further details on the function of a niche.
Living Things in Their Environment
Teacher lesson plan from The Franklin Institute to teach students about ecosystems, habitats, niches, and interactions among living things. Intended for students in grades 8 and up, but could be adapted.