Behavioral Ecology and Sociobiology

, Volume 38, Issue 4, pp 237-244

First online:

Babysitting, dive synchrony, and indications of alloparental care in sperm whales

  • Hal WhiteheadAffiliated withDepartment of Biology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J1

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Abstract

Young sperm whales (Physeter macrocephalus) serially accompany different members of their social group at the surface while the majority of the group is foraging at depth. The presence of a nearby larger whale is likely to increase the survival prospects of the young animal. In studies off the Galápagos Islands, first-year calves were less likely to be seen at the surface alone than were larger whales, and groups containing calves showed less synchronous diving behaviour – shorter intervals with no larger whales at the surface – than those without calves. This difference in diving synchrony was not solely the result of behaviour by individuals assumed to be the mothers of calves (as they spent a disproportionate amount of time accompanying them). Thus babysitting in sperm whales seems to be a form of alloparental care. Its benefit may have been an important factor in the evolution of sociality in female sperm whales.

Key wordsPhyseter macrocephalus Alloparental care Babysitting Diving Synchrony