*Main photo: Ken Bondy Check out this gorgeous photo gallery of sea slugs by National Geographic photographer David Doubilet! These sea slugs, called nudibranchs, have evolved zany colors for your personal enjoyment, and also to warn predators about the toxic compounds they contain. Some nudibranchs make these compounds themselves, but many extract and concentrate toxins from the sponges they eat. Retaining toxic compounds is far from …