David Hall / Sea slug (Melibe viridis) with oral hood for sifting sand in search of prey. Komodo, Indonesia.

Tony Wu / Nudibranch (Melibe pilosa) expanding and extending its semi-transparent oral hood to scoop up rubble and sift through it for food. Lembeh Strait, North Sulawesi, Indonesia.

Hiroya Minakuchi / Lion Nudibranch (Melibe leonina) feeding, California

Juergen Freund / Nudibranch (Melibe fimbriata) with extended oral hood, Batangas, Philippines

Constantinos Petrinos / Dendronotid nudibranch {Melibe fimbriata} resembles mass of algae and has a large cerata (projection from body surface) with rounded oral hood around mouth, Sulawesi Indonesia

Hiroya Minakuchi / Lion Nudibranch (Melibe leonina) feeding, California

Hiroya Minakuchi / Lion Nudibranch (Melibe leonina) feeding, California

David Hall / Hooded nudibranchs (Melibe leonina) with oral hood for catching planktonic prey. In the Pacific Northwest they are often found clinging to bull kelp (Nereocystis luetkeana). Nigei Island, Queen Charlo...

David Hall / Hooded nudibranchs (Melibe leonina) on Bull Kelp (Nereocystis luetkeana). These unusual nudibranchs possess an 'oral hood' which is used to capture plankton. Nigei Island, Queen Charlotte Stra...