While researching a topic, a student has taken the following notes:
- The United States has designated more than 500 areas National Wildlife Refuges (NWRs).
- Some NWRs were established specifically to protect endangered species.
- The Crocodile Lake NWR is a 6,686-acre area in Florida.
- It was established to protect the endangered American crocodile.
- The Ellicott Slough NWR is a 139-acre area in California.
- It was established to protect the endangered Santa Cruz long-toed salamander.