Located along the Greater Texas Coastal Birding Trail, Sea Rim State Park serves as a rest stop for many species of migratory birds traveling the Central Flyway. Warblers, swallows, vireos, grosbeaks, buntings and flycatchers are only a few of the birds that visitors can expect to see. American alligator, mink, nutria, raccoon, rabbit, opossum, skunk, river otter and muskrat are some of the many animals found in the park. At dawn and dusk, bobcats and coyotes can sometimes be seen.
White and brown shrimp, crabs, and various sport fishes, such as red drum, speckled trout and flounder, thrive in the park's lakes and bayous. Rich with plankton and organic matter, the marshland waters serve as a nursery for various species of aquatic life, supporting marine fisheries and migratory waterfowl.