Many grade levels have standards that align to biomes and habitats in the Cobb County Curriculum Guide. Here are some fun links to the Crayola.com website of activities related to this topic. Unfortunately, our school system blocks this site so you'll have to check them out at home - but I think they are worth it. If you have any materials to share on habitats, please send them to me via my Cobb email and we can post them.
12 sided paper globe activity: http://www.crayola.com/lesson-plans/detail/all-about-antarctica-lesson-plan/
ecosystem in danger: rainforest http://www.crayola.com/lesson-plans/detail/ecosystem-in-danger:-brazilian-rainforest-lesson-plan/
Coral reefs in danger (could go with Australia Units) http://www.crayola.com/lesson-plans/detail/fragile-reefs-lesson-plan/