The yellow-lipped Banded Sea Krait (Laticauda colubrina) is a slow swimmer whose bite can easily kill a human. It hunts small fishes and crustaceans in crevices of he reef during the day with impunity.

The Octopus (Octopus vulgaris) is a cephalopod meaning its feet are on its head. It has sophisticated eyes and excellent vision.

A Starfish (Linckia sp.) uses flexible arms to travel across the reef. it has the ability to re-grow lost or damaged arms.

The Sea Apple (Synaptula media) feeds by capturing particles of nutrients with its bronchial tentacles. The tentacles then feed the nutrients into the mouth of the Sea Apple one by one.

The Thorny Oyster (Spondylus varians) is a bi-valve that utilizes its short white spines to attach corals, sponges, worms and sea squirts to its top shell, helping it to blend into the reef for protection.

The Cuttlefish (Sepia latimanus) presents its enemy with raised spikes and uplifted tentacles and flashes intense colors to frighten its intruder.

Sitting at the base of its host anemone and impervious to the sting of the anemone's tentacles, the hump-backed Ambon Shrimp (Thor amboinensis) has a refuge. It feeds on scraps dropped by its host.

This Corallimorpharia (Amplexidiscus fenestrafer) feeds on small fish that rest on it when it lies flat. When hungry, it curls up in a drawstring.

A brilliant Crinoid (Cenometra bella) can have between 19 and 39 arms . This one clings to a feather-like colony of hydroids.

Feeding on algae on the ocean floor, this Nudibranch (Halgerda malesso), marches along unconcernedly. Note the large, orange-tipped ridges on its body.

A Hermit Crab (Dardanus logopodes) perches at the rim of a sponge (Xestospongia sp.) before heading out to feed. Hermit Crabs occupy abandoned shells.

Zebra Crabs (Zebrida adamsii) have legs with spines. The last segment of the leg has a hook used to hold onto the spines of sea urchins as seen here.

The Spanish Dancer (Hexabranchus sanguineus) is the largest of the nudibranchs reaching a maximun size of 12". It undulates through the water column resembling a Spanish dancer, its namesake.

The Elegant Squat Lobster (Allobalathea elegans) has an oval body, sharp rostrum, and abnormally long chelipeds (claw-like appendages) . This one sits in the center of its crinoid host.

A Crinoid (Crinoidea sp.) clings to the side of a wall enjoying the nutrient-laden current while schools of fish swim up and down the wall.

Surgeonfish (Acanthurus mata) have a folding spike on each side of their bodies that they use to slice open attackers.

The Broad Club Cuttlefish (Sepia latimanus), master of disguise, can become speckled, occelate, stipled, lineate, whorled, iridescent, change to any color -- all in different combinations -- and all in less than a second.

The Solar-Powered Nudibranch (Phyllodesmium longicirra) feeds on Leather Corals (genus Carcophyton) and stores the algae in its cerata where the cerata continue to live and to produce nutrients for the nudibranch.

A Green Moray Eel (Gymnothorax funebris) permits a Blue-Lined Cleaner Wrasse (Labroides sp.) to clean its mouth of parasites and diseased tissue. It even allows the wrasse to pick between its teeth.

The Sailfin Goby (Amblyeleotris randalii), usually found on white patches in caves, has beautiful coloring and a large "sail" fin that it raises as a warning to predators.

The Leaf Fish (Taenianotus tricanthus) has a compact body. It sways back and forth in the current in imitation of a leaf while waiting to ambush its prey.

A Bearded Scorpionfish (Scorpaenopsis barbata) lays motionless on hard coral waiting for prey while trusting its camouflage to protect it.

Each of these Tube Worms (Protruba magnifica) has a relatively large (2" to 3" across) colorful brachial crown (the feathery part). The rest of each of the worms (90%) remains hidden in its self-made tube.

A Brittle Star (Ophiothrix sp.) entwines itself within the bright orange polyp leaves of a Sea Pen (Pteroeides sp. 2) at night.

The Moon-Faced Slug (Euselenops luniceps) is a voracious predator and, unlike other slugs, is capable of swimming. it spends most of its life under the sand and only comes out to find food and to mate.

The bell-shaped Upside Down Jellyfish (Cassiopeia Andromeda) has elaborately-fringed branching arms. When at rest, it lies upside down in the sand absorbing sunlight for photosynthesis by the symbiotic algea in its tissues.

A Divaricate Soft True Coral (Dendronepthya (Roxasia) sp.), with polyps open in order to feed on nutrients in the current, hosts a color-coordinated blenny.

An Orangutan Crab (Achaeus jamponicus), aptly named for its long, furry , orange appendages, sits on a bubble anemone.

Brilliant in color with a stunning pattern, this Spiny Lobster (Panulirus versicolor) climbs the wall of a reef at night in search of food.

A pair of Lionfish (Pterois vlitans) cruises along the reef unconcernedly.

The Red-Speckled Blenny (Cirripectes variolosus), appearing to have measles, peers out from his home in an algae-covered rock.

A colony of Sea Squirts (Clavelina flava) cling to the hard substrate of the reef. These Sea Squirts have transparent tunics and twin siphons for filtering nutrients.

A Giant Frogfish (Antennarius commersoni) shows off the fine, intricate pattern etched on his face.

A Pink Anemonefish (Ampihiprion perideraion) peeks out from the tentacles of a Magnificent Sea Anemone (Hecteractis magnifica) that is partially closed while it feeds.

A mating pair of Koror Shrimp (Periclimenes kororensis), with white, spiny heads and eyes and long, transparent chelipeds, rests on a Nipple Anemone (Heliopora actiniformis). NOTE the eggs in the abdomen of the larger shrimp.

Branching, bright red Sea Whips (Ctenocella (Ellisella) sp.) frame a diver in the water column.