Tim Fitzharris / Rio Grande and limestone cliffs of the Sierra Ponce, also known as Mesa de Anguilla, Big Bend National Park, Texas

Tim Fitzharris / Balanced rock in the Grapevine Mountains, Big Bend National Park, Texas

Tim Fitzharris / Rock formation, Cerro Castellan, Big Bend National Park, Texas

Tim Fitzharris / American Agave (Agave americana) aka century plants, Chisos Mountains, Big Bend National Park, Texas

Tim Fitzharris / Agave (Agave sp), Emory Peak, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, Texas

Patricio Robles Gil / Ocotillo (Fouquieria splendens) cactus along the Rio Grande, Big Bend National Park in the Chihuahuan Desert, Texas

Tim Fitzharris / Agave (Agave sp) and Emory Peak, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, Texas

Tim Fitzharris / Opuntia (Opuntia sp) cactus, Chisos Mountains, Big Bend National Park, Texas

Tim Fitzharris / Chisos Mountains, Big Bend National Park, Texas

Tim Fitzharris / Chisos Mountains, Big Bend National Park, Texas

Tim Fitzharris / American Agave (Agave americana), Chisos Mountains, Big Bend National Park, Texas

Tim Fitzharris / American Agave (Agave americana), Chisos Mountains, Big Bend National Park, Texas

Tim Fitzharris / Balanced rock, Grapevine Mountains, Big Bend National Park, Texas

John Abbott / Ironclad beetle (Zopherus xestus) on a white background, Big Bend National Park Texas, USA.