This vast kitty-themed collection illustrates the history of human-cat interaction.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

So many migrating birds roost on the bridge, it has a special summer speed limit.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

High plateaus and beautiful waterfalls frame this ecologically significant nature preserve.

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.

Every four years, millions of salmon fill a river so densely that its waters appear deep crimson.

The largest single concentration of harmless garter snakes in the world is a writhing Canadian serpent orgy.

An annual celebration of the region's successful elk reintroduction program.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Zambia's smallest national park is home to one of the world's largest annual mammal migrations.

Is there such thing as too many fruit bats? Not anymore.

This sacred cave temple is home to thousands of bats and according to legend, a giant snake king.

These "bridges" help confused bats cross the road.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

Cave where bat-eating snakes hang down from the ceiling.

This three-chambered cave is the only protected natural bat hibernaculum in Quebec.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

An unfinished rail tunnel that has since been used to house cheese and bats.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.