Are you what they call a "night owl"? Ever wonder who else is up in the dead of night? You may be happy to know that plenty of creatures are most active while the Sun is down. Find out more about some of these nocturnal animals:

1. Bats
Not all bats are nocturnal--some are crepuscular (active during dawn and dusk). To get around in the dark and find their prey, many bats rely on a sophisticated form of sonar known as echolocation. Many bats, especially the crepuscular ones, have exceptionally good eyesight designed for low levels of light.

2. Goatsuckers
This family of birds, which includes the nighthawk, is also known as nightjars. During the day, they lie on the ground. They spend much of their waking hours capturing (and eating) insects.

3. Cockroaches
Cockroaches spend a lot of time cleaning themselves, but they haven't changed their looks much in 320 million years. Most species also prefer darkness to light, which works out nicely for them since they are nocturnal.

4. Raccoons
These rascals love to come out of hiding at night--and they're a good reason to wait until morning to put your trash out on the curb. They have very nimble front paws--in fact, the word raccoon is a derivative of the Native American word arakun, which roughly means "he who scratches with his hands."

5. Catfish
We don't usually think about "night" and "day" in marine habitats, but apparently catfish do. Catfish are nocturnal scavengers that typically live in shallow water.

7. Lemurs
Most small lemurs (not the large ones) are nocturnal. In fact, the word lemur comes from the Latin lemures meaning "nocturnal spirits."

9. Moray eels
These sea creatures, which can grow to about 10 feet long, do most of their feeding at night. They usually stalk their prey from hidden spots, such as holes in coral reefs.

11. Opossums
Did you know that opossums are only found in the Western Hemisphere? During the day they typically sleep in burrows, and at night they hunt for food. They eat insects, which could be hard to catch, and the rotting flesh of dead animals, which is probably pretty easy to catch.