For social spiders, preying together aids younger siblings

(Phys.org) —The behavior of social spiders may settle debates over the benefits of older siblings. Cornell researchers studying Australian social huntsman spiders have discovered that younger siblings thrive when raised ...

Are elder siblings helpers or competitors?

Having elder siblings decreases mortality risk in childhood, but same-sex elder siblings are associated with lower marriage rates and fewer children for their younger siblings in adulthood, according to the results of a long-term ...

Young birds do household chores

Young birds support their parents in raising youngsters, defending the territory and keeping predators at bay. This social behavior, exhibited by birds such as the mousebird, appear to contradict the prevailing theory of ...

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