Female octopuses throw things at males that are harassing them

An analysis of footage of octopuses off the coast of Australia “throwing” shells and silt suggests that they intentionally target – and often hit – other octopuses. In most cases, it is females that do the throwing, often at males that are harassing them. In 2015, Peter Godfrey-Smith at the University of Sydney and his colleagues filmed several common Sydney octopuses (Octopus tetricus) interacting at a site in Jervis Bay dubbed “Octopolis”. It is one of the few places in the otherwise sandy sea bottom where octopuses can make dens, so there are an unusual number of the animals in a small area.

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