User:Emily.irvin/Nudibranch

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There are more than 2,000 known species, many of which are characterized by the feathery gills and horns on their backs. Generally, most are oblong in shape but can be thick or flattened, or long or short ranging from a quarter of an inch up to a foot. Most nudibranchs are primarily found in shallow, tropical waters. Nudibranchs are gastropods without a shell, the loss of which has been correlated with chemical defense mechanisms, like the stinging capsules in the eolid nudibranchs. Theses defense mechanisms are composed of natural products, that are used to obtain their prey.