Please also use these links about the Avatar creatures:
http://james-camerons-avatar.wikia.com/wiki/Gallery:_Pandoran_Creatures
http://io9.com/#!5420143/5-designers-reveal-secrets-of-james-camerons-avatar
http://www.nevillepage.com/portfolio-2/creatures/
Another good practice is to develop concepts for movies. Let’s take Avatar as an example.
Develop 10 pages in 11x 14 size paper of concept development for the creatures that could live in PANDORA (the planet in AVATAR).
This links can give you a better idea of the planet and the creatures.
http://www.youtube.com/watch?v=mSkmugjSyBQ&NR=1
Pandora