
Look for insects and small fish in the water below the boardwalk. Two species of small, inch-long mosquitofish feed on insect and mosquito larvae. The Big Bend Mosquitofish, Gambusia gaigei, is an endangered species that inhabits this warm fresh-water spring, and is found nowhere else in the entire world. This rare fish has the smallest range of any vertebrate and its survival is threatened by the Western Moquitofish, Gambusia affinis. It is believed the Western Mosquitofish entered this pond courtesy of periodic flooding of the Rio Grande. The National Park Service provides protected breeding ponds to ensure the survival of the Big Bend Mosquitofish.
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Itineraries across USA

Acadia

Arches National Park

Badlands

Big Bend

Biscayne

Black Canyon Of The Gunnison

Bryce Canyon

Canyonlands

Capitol Reef

Carlsbad Caverns

Channel Islands

Congaree

Crater Lake

Cuyahoga Valley

Death Valley

Dry Tortugas

Everglades

Gateway Arch

Glacier

Grand Canyon

Grand Teton

Great Basin

Great Smoky Mountains

Guadalupe Mountains

Haleakalā

Hawaiʻi Volcanoes

Hot Springs

Indiana Dunes

Isle Royale

Joshua Tree

Kenai Fjords

Kobuk Valley

Lassen Volcanic

Mammoth Cave

Mesa Verde

Mount Rainier

North Cascades

Olympic

Petrified Forest

Pinnacles

Rocky Mountain

Saguaro

Shenandoah

Theodore Roosevelt

Virgin Islands

Voyageurs

White Sands

Wind Cave

Yellowstone

Yosemite

Zion