
A piscivore ɔər is a carnivorous animal which eats primarily fish. Piscivory was the diet of early tetrapods (amphibians); insectivory came next, then in time reptiles added herbivory. Some animals, like the sea lion and alligator, are not completely piscivorous, often preying on aquatic invertebrates or land animals in addition to fish, while o...
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http://en.wikipedia.org/wiki/Piscivore

One that eats other fish.
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http://www.aquahobby.com/articles/e_glossary.php

piscivorous, piscivore, piscivory Feeding on fishes; feeding habitually or mainly on fish. This is just one example of nature's piscivorous consumers. —Word Info image © ALL rights reserved. Additional 'fish' units: ichthy-, Iktho Fish Story.
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http://www.wordinfo.info/words/index/info/view_unit/1679/2
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