A nesting gull vocalizes in grass.

A monitor lizard rests on a tree branch in a room with bright lights.

A lion vocalizes behind the bars of a cage.

Vampire bats hang upside down behind stalactites in a cave.

Vampire bats hang closely together in a cave.

Swimming gulls fight over food.

A gull soars near a coast in Iceland.

A gull defends her nest vocally in Iceland.

Gulls flock near a ship at sea in Iceland.

A panther finds a resting place in front of a blue screen.

Gulls land in a sea near the coast of Iceland.

Bird droppings stain a cliff below a flock of nesting gulls.

A gull bathes in a sea in Iceland.

A nesting gull cackles near a rock formation.

A gull nests on a coastal mountain in Iceland.

A gull soars near an islet along a coast in Iceland.

Gulls flock near an islet in a sea along the coast of Iceland.

Vampire bats hang upside down in a dark cave in Belize.

Stalactites frame a colony of vampire bats in a cave.

The heads of vampire bats show behind stalactites in a cave.

A lion on a savanna approaches a fake deer within a predator shield in South Africa.

A bear shudders in a cage.

A vampire bat peers beyond a cave wall in Belize.

Stalactites frame the heads of hanging vampire bats in a cave.