A white-tailed deer emerges from the brush. The Lower Rio Grande Valley National Wildlife Refuge has some of the richest biological diversity in North America–with 1,200 plants, 300 butterflies, and 700 vertebrates, of which 520 are birds.

A white-tailed deer emerges from the brush. The Lower Rio Grande Valley National Wildlife Refuge has some of the richest biological diversity in North America–with 1,200 plants, 300 butterflies, and 700 vertebrates, of which 520 are birds.