Adrian Davies / View from Carn Near, Tresco, Isles of Scilly. UK.

Tony Wu / Skeleton shrimp (Caprella bispinosa) female and babies on Sea lettuce. Venomous spikes on female used to protect young. Hokkaido, Japan. May.

Franco Banfi / Skeleton / Ghost shrimp (Caprellidae). Tasiilaq, East Greenland. April.

David Fleetham / Auger shell (Terebridae) eye to eye with Skeleton shrimp (Caprellidae sp), close-up. Blurry areas in the background where freshwater is percolating up through sand and mixing with saltwater. Philippin...

David Fleetham / Skeleton shrimp (Caprellidae sp), group on Sponge at night, close-up. Dumaguete, Philippines.

David Fleetham / Triton sea snail (Colubraria sp) eye to eye with Skeleton shrimp (Caprellidae sp) on sandy sea floor, close-up. Dumaguete, Philippines, Asia.

David Fleetham / Skeleton shrimp (Caprellidae sp) on sea floor. Blurry areas where freshwater is percolating up through sand and mixing with saltwater. Dumaguete, Philippines

David Fleetham / Calf cowry (Lyncina vitellus) with several Skeleton shrimp (Caprellidae sp) covering sand in front. Dumaguete, Philippines.

David Fleetham / Ringed olive snail (Oliva annulata) surrounded at night by several Skeleton shrimp (Caprellidae sp.), close-up. Dumaguete, Philippines.

Magnus Lundgren / Wild Wonders of China / Skeleton shrimps (Caprellidae) camouflaged on hydroid, Po Bin Chau, Sai kung, Hong Kong, China.

Olga Kamenskaya / Skeleton shrimp (Caprella septentrionalis) mating Novaya Zemlya, Russian Arctic, July

Olga Kamenskaya / Skeleton shrimp (Caprella septentrionalis) mating Novaya Zemlya, Russian Arctic, July

Alex Mustard / Pink skeleton shrimp (Caprella sp.) portrait in red algae. Thistilfjord, Thorshofn, north east Iceland. North Atlantic Ocean.

Joel Sartore / Photo Ark / California skeleton shrimp (Caprella californica) portrait, East Bay Regional Parks Mobile Education Program. Captive, from San Francisco Bay, California, USA.

Tony Wu / Northern pygmy squid (Idiosepius paradoxus) wrapped around a skeleton shrimp (Caprellidae) prey, Yamaguchi Prefecture, Japan.

Tony Wu / Northern pygmy squid (Idiosepius paradoxus) consuming a skeleton shrimp (Caprellidae), Yamaguchi Prefecture, Japan.

Tony Wu / Hairy frogfish (Antennarius striatus) male opening mouth, illicium / rod and esca / lure folded back on top of head. Skeleton shrimp (Caprellidae) parasites on fish's body. Ariake Sea, Japan.

Tony Wu / Hairy frogfish (Antennarius striatus) female on reef, Skeleton shrimp (Caprellidae) parasites on fish's body. Ariake Sea, Japan.

Tony Wu / Hairy frogfish (Antennarius striatus) male with esca / lure extended on illicium / rod to entice prey. Skeleton shrimp (Caprellidae) parasites on fish's body. Ariake Sea, Japan.

David Hall / Red-gilled aeolid nudibranch (Flabellina triophina) moving among Skeleton shrimp (Caprella sp.) The nudibranch does not prey upon amphipods; it eats stinging hydroids. Gambier Bay, Admiralty Island, A...

David Hall / Clown nudibranch (Triopha catalinae) grazing on Lace bryozoans (Membranipora serrilamella) surrounded by several caprellid amphipods, also known as 'skeleton shrimps' (Caprella sp.); Gambier B...

Pascal Kobeh / Skeleton shrimp (Caprella septentrionalis) on kelp Russia. White Sea.