Biological Survey of Texas: Ongoing survey of the fauna of Texas.
Field Guide to Common Texas Insects: Images and descriptions of common Texas insects, from the book "A Field Guide to Common Texas Insects", by Bastiaan Drees and John Jackman.
Herping the Trans-Pecos: A pictorial tour of the reptiles and amphibians of the Trans-Pecos and other areas of West Texas.
Herps of Texas: Listing of the various lizards, turtles and snakes found in Texas with photographs, scientific names, natural history information, and range.
Migratory Wildlife and Wetland Ecology: About Texas Parks and Wildlife habitat management activities.
Texas A&M Fisheries and Aquaculture: Large collection of online publications (PDF files) for aquaculturists and consumers, covering the biology, rearing, and utilization of fish and other aquatic animals.
Texas Cooperative Wildlife Collection: Images and databases of reptiles, mammals, fish, and marine invertebrates.
Texas Entomology: Mike Quinn's site with extensive links to general entomology and Lepidoptera-specific resources.
Texas Freshwater Fishes: Provides images, distribution maps, and abstracts as well as TNHC fish database to search for the species of interest.
Texas Gulf Coast Birding and Naturalist Web: Articles, checklists, maps and links related to birds, butterflies, herps, wild flowers and/or environmental conservation in Texas.
Texas Horned Lizard Watch: Information about the program and horned lizard resources.
Texas Hummingbird Roundup: Includes identifying hummingbirds, the state backyard survey, and other resources.
Texas Marine Mammal Stranding Network: Rescues and rehabilitates marine mammals that strand along the State's coast. Provides information on research, education, mammal rescue, rehabilitation, and release.
Texas Monarch Watch: Web version of a brochure highlighting migration, life cycle, and other monarch butterfly information.
Texas Natural History Collections: Located at the Texas Memorial Museum in Austin. Includes databases, collections, events, and exhibits.
Texas Parks and Wildlife Department: Private Lands Management: Information for individuals who are interested in managing natural resources on their property.
Texas Wildlife Damage Management Service: Manages the negative impacts of wildlife. Includes links to publications and overview of programs such as rabies control
The Texas Wildlife Association: Formed in 1985 by a group of ranchers and wildlife managers dedicated to the conservation, management, and enhancement of wildlife and habitat on private lands.
TX-Butterfly: Archives and subscription management for the e-mail group for butterfliers in Texas.
Wild Texas: Wildlife Guide: Brief accounts of mammal, reptile, and bird species commonly observed in Texas.