White-tailed Kites and Northern Harriers have nested in the park, and Black Rails often call in the dead of night. A wait until sunset will be rewarded with the sight of Barn Owls beginning their grassland patrols. All Seasons Continue west on FM 3005 to the west end of Galveston Island and San Luis Pass. You may access the flats by exiting FM 3005 immediately before the toll bridge. Only Bolivar Flats can rival the wildlife spectacle that is San Luis Pass.
Countless waterbirds pack the sand flats that extend into the bay.
Both species of pelican, Red-breasted Mergansers, and Bonaparte's Gulls feed in the swift waters that course through the pass in winter, and staggering numbers of shorebirds may feed on the flats during a tidal shift. Horned Larks and Wilson's Plovers nest in the dunes. Snowy and Piping plovers winter commonly.