The Biggest Threat to Bighorn Sheep

Bighorn sheep are quickly depleting in number due to a fatal bacteria that spreads like wildfire among herds. Discover the cause of this epidemic that is threatening this icon of the American west.

Go to program

Clip Length 01:17 Premiere: 12/10/18

Recent Episodes

Graduation Day | Becoming Elephant: The Orphans of Reteti

S44 E12 Length 53:33 Premiere Date 04/15/26

Baby Steps | Becoming Elephant: The Orphans of Reteti

S44 E11 Length 53:33 Premiere Date 04/08/26

The Greatest Adventure | Parenthood

S44 E10 Length 54:33 Premiere Date 03/04/26

Jungles | Parenthood

S44 E9 Length 52:22 Premiere Date 02/25/26

Oceans | Parenthood

S44 E8 Length 51:50 Premiere Date 02/18/26

Freshwater | Parenthood

S44 E7 Length 52:14 Premiere Date 02/11/26

Clips & Previews

The Biggest Threat to Bighorn Sheep

Clip Length 01:17 Premiere Date 12/10/18

Running With The Herd: A NATURE Short Film - Sneak Peek

Preview Length 00:51 Premiere Date 12/10/18

Specials

How Tiny Corals Build Underwater Cities | Wild Critters USA

Length 31:13 Premiere Date 09/02/26

The Grand [Canyon] Finale | Sophie's ELECTRIC Road Trip Part 8

Length 25:22 Premiere Date 08/31/26

A Monarch Butterfly’s 3,000-Mile Journey | Wild Critters USA

Length 29:09 Premiere Date 08/26/26

Otherworldly Wonders | Sophie’s ELECTRIC Road Trip Part 7

Length 28:33 Premiere Date 08/24/26

The Turtle that Dances for Worms | Wild Critters USA

Length 25:47 Premiere Date 08/19/26

Liquid Metal, Ancient Mountains | Sophie’s ELECTRIC Road Trip Part 6

Length 31:26 Premiere Date 08/17/26

Dinos, Tortoises, Rats and... Garlic: Massachusetts| Sophie’s ELECTRIC Road Trip Part 5

Length 24:35 Premiere Date 08/10/26

How Do Baby Bald Eagles Learn To Fly? | Wild Critters USA

Length 27:16 Premiere Date 08/05/26

Fast and Curious: Midwest Bikes and NYC Bugs | Sophie's ELECTRIC Road Trip Part 4

Length 25:53 Premiere Date 08/03/26

Ice Age Secrets Frozen in Mammoth Poo | Wild Critters USA

Length 29:00 Premiere Date 07/29/26

The Detour is Worth It | Sophie’s ELECTRIC Road Trip Part 3

Length 28:21 Premiere Date 07/27/26

Horsepower vs Horse Power | Sophie’s ELECTRIC Road Trip Part 2

Length 26:40 Premiere Date 07/20/26

Meet Nature's Water Cleaners | Wild Critters USA

Length 27:29 Premiere Date 07/15/26

Lake Mead Mysteries | Sophie's ELECTRIC Road Trip Part 1

Length 24:16 Premiere Date 07/13/26

The Toughest Moms of the Florida Everglades | Wild Critters USA

Length 27:28 Premiere Date 07/08/26

The Fluffy Guardians of American Grasslands | Wild Critters USA

Length 30:04 Premiere Date 07/01/26

Official Trailer | Wild Critters USA

Length 01:11 Premiere Date 06/24/26

The Tortoise that Saved the Rabbit | Wild Critters USA

Length 27:16 Premiere Date 06/24/26

Project Shark | WILD HOPE

Length 15:35 Premiere Date 03/02/26

The Comeback Cat | WILD HOPE

Length 17:23 Premiere Date 02/02/26

The Butterfly Effect | WILD HOPE

Length 12:24 Premiere Date 01/05/26

A City in Nature | WILD HOPE

Length 14:51 Premiere Date 12/01/25

¿Por qué caen los rayos? | Why does lightning strike?

Length 20:41 Premiere Date 10/14/25

Leones Africanos | African Lions

Length 29:02 Premiere Date 10/09/25

Los Oceanos y los seres humanos | Humans and the oceans

Length 23:05 Premiere Date 10/07/25

Rhino Ops | WILD HOPE

Length 16:28 Premiere Date 10/06/25

Gusanos de Cinta: ¡El animal más largo del planeta! | Ribbon Worms: the longest animal on the planet

Length 34:41 Premiere Date 10/02/25

La nieve y el efecto albedo | Snow and the albedo effect

Length 21:12 Premiere Date 09/30/25

Escarabajo coprófago: El reciclador del popó | Dung Beetle: the poo recycler

Length 32:18 Premiere Date 09/25/25

Biodiversidad: La imaginación de la Tierra | Biodiversity: The imagination of the Earth

Length 24:23 Premiere Date 09/23/25

Pulpo Gigante del Pacifico: 8 brazos y 9 cerebros

Length 34:48 Premiere Date 09/18/25

Giant Pacific Octopus: 8 arms and 9 brains

Length 30:02 Premiere Date 09/18/25

Titanoboa: La serpiente más grande de la historia

Length 23:00 Premiere Date 09/16/25

Titanoboa: The largest snake that ever lived

Length 32:54 Premiere Date 09/16/25

Fitoplancton bioluminiscente de Puerto Rico | Puerto Rico's bioluminescent phytoplankton

Length 34:11 Premiere Date 09/16/25

Series Trailer | Mes de Herencia Hispana con Cumbre Kids

Length 02:01 Premiere Date 09/15/25

Bat Vax | WILD HOPE

Length 14:47 Premiere Date 09/01/25

Puffling Patrol | WILD HOPE

Length 13:15 Premiere Date 08/04/25

Thunder & Fire | WILD HOPE

Length 18:52 Premiere Date 07/07/25

The Women Behind the Wild | In Her Nature

Length 30:40 Premiere Date 06/26/25

Significant Otters | WILD HOPE

Length 15:28 Premiere Date 06/02/25

The Chameleon Queen | In Her Nature

Length 13:25 Premiere Date 05/15/25

Reclaiming Bear River | WILD HOPE

Length 17:25 Premiere Date 05/12/25

The Slowest Stampede on Earth | In Her Nature

Length 19:31 Premiere Date 05/01/25

Saving The Slowest Mammal on Earth | In Her Nature

Length 37:46 Premiere Date 04/17/25

Building for Birds | WILD HOPE

Length 16:03 Premiere Date 04/07/25

Saving the World’s Rarest Lemurs | In Her Nature

Length 22:01 Premiere Date 03/27/25

Series Trailer | In Her Nature

Length 01:25 Premiere Date 03/13/25

The Rhino Whisperer | In Her Nature

Length 20:51 Premiere Date 03/13/25

Mission Impossible | WILD HOPE

Length 39:41 Premiere Date 11/18/24

Guano Gold | WILD HOPE

Length 09:34 Premiere Date 10/28/24

Pangolin Protectors | WILD HOPE

Length 12:24 Premiere Date 10/21/24

Way of the Elephants | WILD HOPE

Length 15:11 Premiere Date 10/07/24

Whale Shark Homecoming | WILD HOPE

Length 16:49 Premiere Date 09/23/24

AI of the Tiger | WILD HOPE

Length 14:31 Premiere Date 09/09/24

Stork Sisters | WILD HOPE

Length 16:40 Premiere Date 08/26/24

Cougar Crossing | WILD HOPE

Length 13:56 Premiere Date 08/12/24

The Great Ocean Cleanup | WILD HOPE

Length 15:12 Premiere Date 07/22/24

Unleaded | WILD HOPE

Length 13:11 Premiere Date 07/08/24

America's BFF | WILD HOPE

Length 18:11 Premiere Date 06/24/24

Protecting Paradise | WILD HOPE

Length 14:11 Premiere Date 06/10/24

The Frog Ark | WILD HOPE

Length 16:08 Premiere Date 05/28/24

Jaguar Passage | WILD HOPE

Length 13:03 Premiere Date 05/27/24

Road Warriors | WILD HOPE

Length 09:16 Premiere Date 05/13/24

Rebuilding a Forest | WILD HOPE

Length 15:56 Premiere Date 04/22/24

One Golden Chance | WILD HOPE

Length 09:57 Premiere Date 04/08/24

Gardener to Guardian | WILD HOPE

Length 13:11 Premiere Date 03/14/24

Vertical Meadows | WILD HOPE

Length 07:36 Premiere Date 03/14/24

The Serpent's Lair | WILD HOPE

Length 11:50 Premiere Date 03/14/24

Turtle Trackers | WILD HOPE

Length 11:27 Premiere Date 03/14/24

A Farm Goes Wild | WILD HOPE

Length 08:36 Premiere Date 03/14/24

Return of the Manatees | WILD HOPE

Length 16:01 Premiere Date 03/14/24

Coral Comeback | WILD HOPE

Length 10:47 Premiere Date 03/14/24

Seabird Sanctuary | WILD HOPE

Length 10:53 Premiere Date 03/14/24

Birds on the Brink | WILD HOPE

Length 10:16 Premiere Date 03/14/24