Dolphin males leave sponging to the females

Sexual stereotypes are not the preserve of humans - male dolphins seem reluctant to adopt a technique that females are keen to learn. Male dolphins, it seems, are not interested in learning how to use a sponge, but their sisters are. Dolphins were first seen carrying sponges cupped over their beaks in Shark Bay, Australia, in the 1980s. Janet Mann of Georgetown University in Washington, DC, and colleagues have now reviewed data collected during 20 years spent monitoring this group of dolphins and found that, while mothers show both their male and female calves how to use sponges, female calves are almost exclusively the only ones to apply this knowledge.
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