Programs and field trips, information on native plants and birding sites, photos and MP3 bird calls for identification, and organization's leaders and structure.

Butterfly photos and links to valley wildlife viewing areas and butterfly, birding, and odonate resources.

Irrigation, water diversions, and the Rio Grande River; a discussion of environmental concerns by the U.S. Geological Survey.

Study is a joint project between the University of Texas Pan American, the University of Texas at Austin Center for Space Research, and the University of Texas - San Antonio.

Events, butterfly hotspots, checklists, field notes and photos, with articles and links.

The purpose of the literature survey is to identify information relevant to freshwater and pollutant discharges from the Rio Grande and Arroyo Colorado and the potential and known impacts of these discharges within the project area, identify those areas where there is an absence or paucity of data, and make recommendations for future studies and planning efforts.

Organization to support wildlife and vegetation in the Lower Rio Grande Valley national wildlife refuges.

Federal government information relating to the Rio Grande River's designation as an American Heritage River.

Mission is to preserve, enhance and expand the native wildlife habitat of the Rio Grande Valley. Information on membership, conservation projects, with photos and books.

A Harlingen, Texas environmental organization that helps to preserve the natural beauty and environment of the Lower Rio Grande Valley and Mexico.

Las Palomas, Lower Rio Grande Valley recreation areas, with directions and a description of facilities.