Stock Footage0:16
Getty Images

Bats hang from the roof of a cave.

Pre-K - Higher Ed
Bats hang from the roof of a cave.
Stock Footage0:09
Getty Images

A vampire bat chews on the ear of a sleeping pig and crawls over its back.

Pre-K - Higher Ed
A vampire bat chews on the ear of a sleeping pig and crawls over its back.
Stock Footage0:12
Getty Images

A bird flies low over a swamp.

Pre-K - Higher Ed
A bird flies low over a swamp.
Stock Footage0:31
Getty Images

A howler monkey perches in a tree and vocalizes.

Pre-K - Higher Ed
A howler monkey perches in a tree and vocalizes.
Stock Footage0:25
Getty Images

A bird perches on a narrow branch.

Pre-K - Higher Ed
A bird perches on a narrow branch.
Stock Footage0:47
Getty Images

A parrot perches in a tree and eats fruit.

Pre-K - Higher Ed
A parrot perches in a tree and eats fruit.
Stock Footage0:31
Getty Images

A howler monkey vocalizes as it perches on a branch.

Pre-K - Higher Ed
A howler monkey vocalizes as it perches on a branch.
Stock Footage0:35
Getty Images

Clouds drift over wooded mountains.

Pre-K - Higher Ed
Clouds drift over wooded mountains.
Stock Footage0:44
Getty Images

An orange moon glows in a black sky.

Pre-K - Higher Ed
An orange moon glows in a black sky.
Stock Footage0:11
Getty Images

An iguana explores a leafy tree.

Pre-K - Higher Ed
An iguana explores a leafy tree.
Stock Footage0:40
Getty Images

A monkey perches in a tree and eats leaves.

Pre-K - Higher Ed
A monkey perches in a tree and eats leaves.
Stock Footage0:21
Getty Images

A howler monkey crawls along a branch.

Pre-K - Higher Ed
A howler monkey crawls along a branch.
Stock Footage0:14
Getty Images

A vampire bat chews on the ear of a sleeping pig.

Pre-K - Higher Ed
A vampire bat chews on the ear of a sleeping pig.
Stock Footage0:19
Getty Images

A vampire bat chews on the ear of a pig.

Pre-K - Higher Ed
A vampire bat chews on the ear of a pig.
Stock Footage0:50
Getty Images

A scientist with a headlamp explores a cave with the bright outside world visible beyond the cave opening.

Pre-K - Higher Ed
A scientist with a headlamp explores a cave with the bright outside world visible beyond the cave opening.
Stock Footage0:14
Getty Images

Sunlight beams through trees near a cave in Belize.

Pre-K - Higher Ed
Sunlight beams through trees near a cave in Belize.
Stock Footage0:11
Getty Images

A pig scrounges for food beneath a lantern in a palm tree.

Pre-K - Higher Ed
A pig scrounges for food beneath a lantern in a palm tree.
Stock Footage0:12
Getty Images

A vampire bat pesters a pig and chews on its ear.

Pre-K - Higher Ed
A vampire bat pesters a pig and chews on its ear.
Stock Footage0:11
Getty Images

A vampire bat sucks the blood of a pig that sleeps in a sty.

Pre-K - Higher Ed
A vampire bat sucks the blood of a pig that sleeps in a sty.
Stock Footage0:14
Getty Images

Pigs nose in the dirt at night.

Pre-K - Higher Ed
Pigs nose in the dirt at night.
Stock Footage0:21
Getty Images

A spelunker climbs up a rock face to reach the entrance to a cave.

Pre-K - Higher Ed
A spelunker climbs up a rock face to reach the entrance to a cave.
Stock Footage0:18
Getty Images

A vampire bat feeds on the blood of a sleeping pig.

Pre-K - Higher Ed
A vampire bat feeds on the blood of a sleeping pig.
Stock Footage0:41
Getty Images

Monkeys sit together on a high, leafy branch.

Pre-K - Higher Ed
Monkeys sit together on a high, leafy branch.
Stock Footage0:39
Getty Images

A black and yellow bird perches on a leafy branch and looks around.

Pre-K - Higher Ed
A black and yellow bird perches on a leafy branch and looks around.