Orca mothers are known from previous research to provide their female offspring with less support than their male offspring, especially after daughters reach adulthood. The team looked at data ...

A new study has found that male southern resident killer whales are less likely to get scraped up by other whales when they have their post-menopausal mothers by their sides.

How long an orca lives depends on its sex. Females live longer than males. In fact, some female orcas have outlived their male counterparts by more than 20 years, according to the nonprofit Wild Orca.

LONDON — Orca whale mothers sacrifice so much energy parenting and feeding their male offspring that it drastically reduces their chances of raising another calf again, a new study has found ...

LONDON - Orca whale mothers sacrifice so much energy parenting and feeding their male offspring that it drastically reduces their chances of raising another calf again, a new study has found.

Female orcas who had a son were about 50 percent less likely than those who had daughters to have another whale baby survive its first year of life, the study found.