A study in 'Nature' shows that menopause in toothed whales like orcas and belugas is an evolutionary trait to extend lifespan without affecting reproductive years.

Post-menopausal female toothed whales live roughly 40 years longer than their size would suggest, allowing more time for offspring care.

The findings support the 'live-long' hypothesis, highlighting the importance of intergenerational relationships in the evolution of menopause.

The research challenges the male-driven menopause hypothesis, noting shorter male lifespans in species with menopause.

Interpretation of the study is cautioned due to possible biases and the small size of whale population samples.