Kevin Schafer / Red and Green Macaw (Ara chloroptera) group at clay lick, Madre de Dios River, Peru

Pete Oxford / Upside down Jellyfish (Cassiopeia sp) Jardines de la Reina National Park, Cuba, Caribbean

Suzi Eszterhas / Two Purple / Striped Jellyfish (Pelegia / Chrysaora colorata) Monterey Bay Aquarium, California, USA, Captive

David Shale / Deepsea Medusa jellyfish (Colobonema sp), Mid-Atlantic Ridge, North Atlantic Ocean

Chris Newbert / Papuan Jellyfish (Mastigias papua) 20 feet deep, Solomon Islands

Chris Newbert / Papuan Jellyfish (Mastigias papua) 20 feet deep, Solomon Islands

Pete Oxford / Upside down Jellyfish (Cassiopeia sp) Jardines de la Reina National Park, Cuba, Caribbean

Christian Ziegler / Upside-down Jellyfish (Cassiopea xamachana) floating between the aerial roots of Red Mangrove (Rhizophora mangle), Twin Cays, Carrie Bow Cay, Belize

Pete Oxford / Upside-down Jellyfish (Cassiopea xamachana), Bonaire, Netherlands Antilles, Caribbean

Juergen Freund / Decorator crab (Dorippe frascone) with an Upside down jellyfish (Cassiopea andromeda) on its back. The jellyfish is bigger than the crab! Palawan, Philippines.

Jurgen Freund / Carrier crab (Dorippe frascone) with an upside down jellyfish (Cassiopea andromeda) on its back. The jellyfish is bigger than the crab! Palawan, Philippines

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp) pair on ocean floor, Jardines de la Reina National Park, Cuba

Georgette Douwma / Upside down jellyfish (Cassiopeia andromeda) on sea bed, Rinca, Komodo National Park, Indonesia, October

Juergen Freund / Specimens of Upside-down jellyfish {Cassiopeia sp} collected as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Juergen Freund / Jo Browne removes with a pipet, mucous emitted by stressed Upside-down jellyfish specimens, part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Juergen Freund / Joanna Browne collecting an 'upside down jellyfish' {Cassiopeia sp} from the sandy bottom of Lizard Island lagoon, for Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Tim Laman / Upsidedown Jellyfish {Cassiopeia sp} in a mangrove lagoon amongst the roots of Red Mangrove trees. Tunicate Cove, Belize. This jellyfish has symbiotic algae in its tentacles and stays upside-down to p...

Tim Laman / Upsidedown Jellyfish {Cassiopeia sp} in a mangrove lagoon amongst the roots of Red Mangrove trees. Tunicate Cove, Belize. This jellyfish has symbiotic algae in its tentacles and stays upside-down to p...

David Shale / Deep sea medusa {Solmissus sp} Gulf of Maine, Atlantic

Juergen Freund / Upside down jelly free swimming (Cassiopeia sp) Caribbean

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} Kakaban Lake, Kalimantan, Indonesia

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Indonesia, Kakaban

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} about to be eaten by sea anemone, Indonesia,

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Kakaban Lake, Kalimanta

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Indonesia, Kakaban

Juergen Freund / Upside-down jellyfish {Cassiopeia sp} caught by sea anemone, Indonesia, Kakaban

Chris Newbert / Papuan Jellyfish (Mastigias papua) 20 feet deep, Solomon Islands

Chris Newbert / Papuan Jellyfish (Mastigias papua) 20 feet deep, Solomon Islands

Norbert Wu / Papuan Jellyfish (Mastigias papua) this species stings, relative to non-stinging species in lakes, Palau

Norbert Wu / Upside-down Jellyfish (Cassiopea xamachana) with symbiotic Algae (Zooxanthellae) in body, Caribbean

Norbert Wu / Papuan Jellyfish (Mastigias papua) has a powerful sting as opposed to their stingless cousins in landlocked Jellyfish Lake, Palau

Norbert Wu / Upside-down Jellyfish (Cassiopea xamachana) lies on bottom, symbiotic algae (Zooxanthellae) in body, Caribbean

Norbert Wu / Papuan Jellyfish (Mastigias papua) often lies upside-down on lagoon floor, South Pacific

Norbert Wu / Papuan Jellyfish (Mastigias papua) in rare landlocked lake, Kakaban Island, Borneo

Norbert Wu / Upside-down Jellyfish (Cassiopea xamachana) in rare landlocked lake, Kakaban Island, Borneo

Francis Abbott / Upside down jellyfish (Cassiopeia andromeda) Pacific, Yap, Palau.

Juergen Freund / Upside down jellyfish {Cassiopeia) Caribbean

Juergen Freund / Upsidedown jellyfish {Cassiopeia sp} + anemone in brackish water lake, Kalaban Is, Kalimantan, Indonesia. Anemones feed on jellyfish

Norbert Wu / Jack (Pseudocaranx sp) juveniles find shelter within stinging tentacles of jellyfish, South Australia, Australia

Christian Ziegler / Upside-down Jellyfish (Cassiopea xamachana), Bastimentos Marine National Park, Bocas del Toro, Panama

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

Pete Oxford / Upside-down Jellyfish (Cassiopea sp), Jardines de la Reina National Park, Cuba

David Hall / Upside down jellyfish {Cassiopeia frondosa} Dominica West Indies Symbiotic algae in