Among some killer whale moms, lifelong feeding for adult sons but not daughters could be a long-term investment play. The delayed payoff? Greater grandmotherly glory.
Females in a quirky population of killer whales off the Pacific Coast of North America let their grown mama’s boys share fish that mom catches. Biologists have known that this pampering continues throughout a son’s life, which can last decades. Grown daughters, often feeding their own offspring, however, don’t get such a bonus.
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