Download a professional PDF field guide featuring all the species found in Lower Rio Grande Valley National Wildlife Refuge. Perfect for outdoor adventures, education, and nature exploration.
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Compared to 8 nearby locations in Willacy County County, Texas
These comparisons are based on documented wildlife observations from citizen science data. Locations with higher species counts may have more observation activity, different habitat types, or larger coverage areas. Regional rankings help identify biodiversity hotspots and unique natural areas within Willacy County County.
Showing 20 most frequently observed species out of 80 total documented species.

Javelina


Texas Silverleaf

Guineagrass

Silverleaf Nightshade
Northern Mockingbird
Queen

Triangle Cactus

Baird'S Sandpiper
Scissor-Tailed Flycatcher
Crested Caracara
American Snout

Texas Toad
Moth
Western Pygmy Blue Butterfly


Slender Dwarf Morning-Glory

Texas Ebony
Texas Spotted Whiptail
Get all 80 species with 3-4 high-quality images each, detailed descriptions, and a downloadable PDF for offline use.
The Lower Rio Grande Valley National Wildlife Refuge ecosystem supports 80 documented wildlife species across 77 taxonomic genera. Located in Willacy County, Texas, this area provides critical habitat with diverse natural communities. The location hosts 17 frequently observed species and 15 occasionally documented species, creating a balanced ecosystem with both resident and visiting wildlife. Compared to nearby Willacy County, Lower Rio Grande Valley National Wildlife Refuge hosts 7% more species diversity. This location ranks #7 for species diversity among 100 Willacy County County natural areas, placing it in the 93th percentile for biodiversity.