Cooperation by non-kin during birth underpins sperm whale social complexity
Summary
We quantitatively document a sperm whale birth event, revealing collective support behaviors across kinship lines. Using high-resolution drone footage, computer vision, and multiscale network analysis, we studied the interactions within a Caribbean sperm whale unit comprising two matrilines. Our results suggest that a female family member led birth assistance and that after delivery, all individuals oriented toward and helped lift the newborn, taking turns in a coordinated, cross-kin effor
Content
# Cooperation by non-kin during birth underpins sperm whale social complexity
*Published: 2026 Mar 26*
We quantitatively document a sperm whale birth event, revealing collective
support behaviors across kinship lines. Using high-resolution drone footage,
computer vision, and multiscale network analysis, we studied the interactions
within a Caribbean sperm whale unit comprising two matrilines. Our results
suggest that a female family member led birth assistance and that after
delivery, all individuals oriented toward and helped lift the newborn, taking
turns in a coordinated, cross-kin effort. Despite historically observed foraging
segregation, kinship barriers dissolved as all unit members contributed. These
analyses provide evidence of birth attendance, or assistance, in a nonprimate
species, a behavior long considered characteristic only of humans and their
close relatives.
DOI: 10.1126/science.ady9280