site:edu
site:gov
Because universities and government agencies & departments sponsor and conduct scientific research (and then publish their findings).
If your animal doesn't live in the United States, you may want to search for information about your animal in domains from the animal's geographic location. Here's a list of country codes.
For example, if you want to find information from Brazil about the Hyacinth Macaw, set up your search like this:
site:BR "hyacinth macaw"
