Social unit of male sperm whales

Description:However, concurrent mothers may simply end up as each other's babysitters if calves are attracted to each other at the surface given they cannot dive for as long as their mothers. Generalized reciprocity allows for the evolution of generous strategies and the possibility of prosocial norms [ 51 ]. This damage may indicate that sperm whales are susceptible to decompression sickness, and sudden surfacing could be lethal to them. A few males leave when quite young, while others leave well into maturity range 9—19 years old , typically when their mothers had another calf [ 45 ]. Gero , unpublished data , a vocalization typically made by mature males [ 44 ]. One hypothesis is that the teeth are used in aggression between males.

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