Optimal foraging theory means that turning down food is sometimes more efficient than eating it - but even then, what’s “wasted” doesn’t necessarily go to waste.

There are wild hybridizations happening all the time! Here are five weird and wild hybrids that aren't just cool but could teach us something too. Hosted by: Hank Green (he/him) 0:00 Intro 1:06 Arctic Oddballs 3:43 Bouncing Baby Bears...

Grizzly bears stick to a mostly vegetarian diet in sync with plant growing seasons. However, as grizzlies' habitats grow smaller, food is harder to come by. Using NASA satellites, scientists track the shifting, interrelated patterns of...

Paul Andersen explains how ecosystems interact with biotic and abiotic factors. He explains and gives examples of food chains and food webs. He shows how limiting factors eventually leads to logistic growth. Real data from Yellowstone...

Watch the bears have a great time after waking up to 15 tons of snow.

Despite a growth plate issue, this orphaned grizzly still manages to hold her own against her big brother, who's nearly 300 pounds bigger.

Watch the bears have a great time after waking up to 15 tons of snow.

Find out what where she gets her unique name.

It's a great opportunity to see the bears' natural behaviors, such as digging for hidden food.

Watch the bears have a great time after waking up to 15 tons of snow.

It's a great opportunity to see the bears' natural behaviors, such as digging for hidden food.

Despite a growth plate issue, this orphaned grizzly still manages to hold her own against her big brother, who's nearly 300 pounds bigger.

Find out what where she gets her unique name.

Learn about all the different kinds of enrichment activities zookeepers use to stimulate a pair of grizzly bear brothers.

A donation of 15 tons of snow has these grizzlies in a tizzy.

Watch San Diego Zoo's "Grizzly Boys" have fun trying to find what's buried beneath the snow.

It's a great opportunity to see the bears' natural behaviors, such as digging for hidden food.

Despite a growth plate issue, this orphaned grizzly still manages to hold her own against her big brother, who's nearly 300 pounds bigger.

Witness a day in the life of two grizzly brothers, Scout and Montana. Their favorite food may not be what you expect.

It's a great opportunity to see the bears' natural behaviors, such as digging for hidden food.

Watch the bears have a great time after waking up to 15 tons of snow.

Ozzy was having trouble acclimating to his new surroundings, until he was introduced to Bruno. Now, the two are "best buds."

A donation of 15 tons of snow has these grizzlies in a tizzy.

An animal that eats both meat and plant materials.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...