Subscribe Now! National Geographic Magazine $15
Visit our Online Shops

Sign up for free

Newsletters

Once a month
get new photos
and expert tips.

Nudibranch on a Reef

Photo: Florida regal goddess nudibranch
A Florida regal goddess nudibranch eats its way along the Gray's Reef Marine Sanctuary.
Photograph courtesy Gary's Reef Marine Sanctuary/NOAA

Multimedia

Underwater Animal Features

Photo: Spanish hogfish

Sleeping With the Fishes

See the amazing undersea discoveries made by a team of aquanauts in this multimedia feature.

Photo: Greenspot nudibranch

Photo of the Day: Stylish Slug

See a greenspot nudibranch feeding on poisonous sea plants. The nudibranch incorporates the toxins for its own self-defense.

Photo: Coral reef

One Fish, Two Fish …

Experience coral reefs and their wild shapes and colors in this multimedia feature.

Photo: Coral reef

Virtual World: Barrier Reef

Bring your scuba gear and take a virtual trip to Australia to see the amazing diversity of species on the Great Barrier Reef.

Photo: A Nembrotha kubayana

Living Color

Found from sandy shallows and reefs to the murky seabed nearly a mile down, toxic nudibranchs—soft, seagoing slugs—produce a brilliant defense.

You need the Flash Player version 8.0.0.0 or higher and a JavaScript enabled browser to view this site

Special Advertising Sections

Phot: Girl drinking bottled water

Interactive Map

Explore the signs of and solutions to the world’s water crisis.

Photo: The Cloud Gate in Chicago

Download City Guides

Check out the local hotspots with downloadable city guides.

Invertebrates Right Rail

Get the Latest Headlines

Photo: Blue poison dart frogs

Make us your online news source.

Get Animal Pictures

Photo: Giant octopus

Get your daily dose of photos.

For Kids!

Photo: A cartoon dog

It's no stretch to find fun facts on our Kids site!

Shop National Geographic DVDs

Photo: Human Footprint DVD cover

Whatever your interest, you'll be entertained and educated with our collection of best-selling DVDs.