Play's the Thing: Some young animals spend hours running, leaping, boxing, and wrestling, while others seem to have much less fun. Could it be a case of mind over metabolism?.

• Autores: John A. Byers
• Localización: Natural history, ISSN 0028-0712, Vol. 108, Nº. 6 (JUL-AGO), 1999, págs. 40-45
• Idioma: inglés
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