Butterflies of Ellis County, Texas
- Information about and pictures of all the known species of butterflies in the county.
- http://www.butterfliesandmoths.org/map?dc=5607&_dcc=1&si=44

Ellis County Report: Pollution Locator
- Map of the polluting sources, air quality ranking, and other pertinent environmental data for Ellis County, TX.
- http://www.scorecard.org/env-releases/cap/county.tcl?fips_county_code=48139#maps

Ellis County Watershed Template
- From the Environmental Protection Agency; explores America's water resources with an emphasis on the quality of our Nation's water and features powerful searching, mapping, database querying, and informative hot links.
- http://cfpub.epa.gov/surf/county.cfm?fips_code=48139

Amphibians and Reptiles in Ellis County
- Texas Cooperative Wildlife Collection list of species found in the county.
- http://wfscnet.tamu.edu/tcwc/checklist/ELLIS070.HTM