(New Scientist)
Most sponges are flat, but tool-using dolphins select conical ones that will not fall off their snouts. The majority of dolphin “spongers” are females.
[…]
Krützen also has an idea about why males do not like using sponges. “Males are more interested in forming alliances with other males than sponging,” he says. “They have a different social life than females, and this might restrict them to invest too much time in sponging, which is quite a solitary activity.”
I am sure many male mammals would concur.
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