Centro de Antropología, Instituto Venezolano de Investigaciones
Científicas, Apartado 66.755, Caracas 1061-A, Venezuela
Dionisios Youlatos
Department of Zoology, School of Biology, Aristotle University of
Thessaloniki, 54124 Thessaloniki, Greece
Martín M. Kowalewski
Estación Biológica Corrientes, Museo Argentino de Ciencias
Naturales “Bernardino Rivadavia”, CONICET, Ruta Prov. 8, Km 7, 3400, San
Cayetano, Corrientes, Argentina
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Sleep is the longest and most continuous behavioral phase in the 24 h cycle of mammals. However, selection of postures, substrates, and tree parts during sleep has not been adequately explored, as well as their evolutionary consequences. The present study investigates postural behavior, substrate, and tree part use during sleep in three howler species (A. palliata, A. macconnelli, and A. caraya) in Nicaragua, French Guiana, and Argentina. All three species were consistent in the use of a crouch.
Sleep is the longest and most continuous behavioral phase in the 24 h cycle of mammals. However,...