Jellies live in virtually every part of the ocean and come in a dizzying array of shapes, sizes, and colors. Some, like the aquarium's box jellies, are no bigger than a thimble.

Out in the open ocean, massive gatherings of jellies feed on plankton. Perhaps they are filling in for declining fish stocks.

Beneath Antarctica's frozen seas lies one of Earth's most stable and vibrant ecosystems -- and one of its most enchanting realms. Visit a fantastic world hidden "Under Antarctic Ice."

The man behind the incredible images is Norbert Wu, an independent photographer and filmmaker who has photographed in nearly every conceivable locale.

Beneath Antarctica's frozen seas lies one of Earth's most stable and vibrant ecosystems -- and one of its most enchanting realms. Visit a fantastic world hidden "Under Antarctic Ice."

Snakes are not the only creatures that use venom. Scorpions, shrews, spiders, insects, salamanders, and even some types of plants also use poisonous venoms.