Sus pies dejaban una estela de vapor, y sus bocas bostezaban con hambre mortal como insectos. | Their feet trailed away into vapor, and their mouths yawned with deadly, insect-like hunger. |
Desde un punto de vista evolucionario, la ausencia de contagio del bostezo en otras especies sugiere que los primates humanos bostezaban como una manera de coordinar comportamiento social, como señalar un evento que requiere alerta o prepararse para el sueño. | From an evolutionary standpoint, the absence of contagious yawning in other species suggests that human primates yawned as a way to coordinate social behavior, such as signaling an event that requires alertness, or preparing for sleep. |
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