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Helmet Urchins, or Shingle Urchins and in Hawaiian are called kaupali which translates to "cliff hanging." These urchins are found in the harsh intertidal zone of the volcanic shores of Hawaii.

The flying gurnards are a family, Dactylopteridae, of marine fish notable for their greatly enlarged pectoral fins. As they cannot literally fly, an alternative name preferred by some authors is helmet gurnards. by Alcides Dutra

The Telegraphfrom The Telegraph

Environment

A turtle swims through a make-shift underwater car wash, surrounded by a bright shoal of yellow tangs eager to rid him of algae that had collected on his shell. Photographer Masa Ushioda captured the sight off the coast of Kailua Kona, in Hawaii.

Mail Onlinefrom Mail Online

Rather chew than me: Nerveless diver captures stunning close up shots of gaping shark mouths with razor sharp teeth

A lemon shark pictured up close and personal in the Bahamas

Sea Angels, jewel squid and helmet jellies are among 17,000 new species found during 210 expeditions of the deep ocean for the International Census of Marine Life.

The Cyphonia treehopper has a "helmet" extending from its upper thorax that resembles a predatory ant

Humuhumunukunukuapua'a, Rhinecanthus rectangulus, (saw snorkeling off Kahekili Beach) about 12" long (biggest I've seen)