Doug Perrine / Pink anemonefish {Amphiprion perideraion} on host sea anemone {Heteractis magnifica} Great Barrier Reef, Queensland, Australia

Fred Bavendam / Pink Anemonefish (Amphiprion perideraion) nestled among the tentacles of its Sea Anemone host, Great Barrier Reef, Queensland, Australia

Chris Newbert / Blackfinned Clownfish (Amphiprion percula) in bleached Magnificent Sea Anemone (Heteractis magnifica) host, Papua New Guinea

Fred Bavendam / Pink Anemonefish (Amphiprion perideraion) nestled among the tentacles of its Sea Anemone host, Coral Sea, Queensland, Australia

PREMAPHOTOS / Pupae of parasitic wasp {Braconidae family} on hawkmoth caterpillar host, Peru, South America

Birgitte Wilms / Pink Anemone fish (Amphiprion perideraion) in host Magnificent Sea Anemone

Birgitte Wilms / Blackfinned Clownfish (Amphiprion percula) in bleached Magnificent Sea Anemone (Heteractis magnifica) host, 30 feet deep, Papua New Guinea

Chris Newbert / Blackfinned Clownfish (Amphiprion percula) pair in Magnificent Sea Anemone (Heteractis magnifica) host, Solomon Islands

Birgitte Wilms / Blackfinned Clownfish (Amphiprion percula) in bleached Sea Anemone host, 30 feet deep, Solomon Islands

Chris Newbert / Blackfinned Clownfish (Amphiprion percula) in a Magnificent Sea Anemone (Heteractis magnifica) host, Solomon Islands

Norbert Wu / Blackfinned Clownfish (Amphiprion percula) pair, safe among stinging tentacles host Magnificent Anemone (Heteractis magnifica), Solomon Islands

Mark Moffett / Ant (Philidris sp) feeding on the oily orange spores of a host fern The ant lives in the fern's stem, where it drags nutrient rich debris to create compost for the fern, Borneo.