I watch movies from sci-fi series such as Star Wars and Riddick. They have such amazing (and deadly) creatures in those films. I try to create equally stunning fauna for my stories and I always seem to come up short.
I do have a few species created for my book series, but I wish I had more to work with. I bought a prehistoric wildlife book from Half Price Books and that seemed to help a little, but still, I feel I could use some help creating critters for my yarns.