Giraffe grandmothers are high-value family members, say scientists

As with elephants and orcas, worldly wisdom and childcare brings group-survival perks, research suggests

Pillars of family life, the community and often the workplace, grandmothers are a crucial component of human society - now researchers say they may also play an important role among giraffes.

Experts conducting a review of giraffe social behaviour say female giraffes live for about eight years after they can no longer reproduce - up to about 30% of their lives.