Ectotherm

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Pseudemys turtles (shown here basking for warmth) are ectothermic.
Junonia lemonias is basking under the sun.

Ectotherm is an organism that needs heat to control their body temperature.[1] The word "Ecototherm" is from the Greek word εκτός (ektós) "outside" and θερμός (thermós) "hot". Many animals including turtles, butterflies and frogs needs heat in order to digest their foods.[2] If heat is not provided, their metabolism rate will go down. They will stop eating and die.[3]

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  1. Davenport, John. Animal Life at Low Temperature. Publisher: Springer 1991. ISBN: 978-0412403507
  2. Jay M. Savage ; with photographs by Michael Fogden and Patricia Fogden. (2002). The amphibians and reptiles of Costa Rica : a herpetofauna between two continents, between two seas. Chicago, Ill.: University of Chicago Press. p. 409. ISBN 0-226-73538-9.
  3. Milton Hildebrand; G. E. Goslow, Jr. Pprincipal ill. Viola Hildebrand. (2001). Analysis of vertebrate structure. New York: Wiley. p. 429. ISBN 0-471-29505-1.