![]() They identified 102 instances of debris throwing in a group of roughly 10 octopuses, where the chosen projectile was either silt, shells, algae or a mixture of them. 'There is some evidence that some of these throws that hit others are targeted, and play a social role.'įor their analysis, published today in PLoS ONE, researchers recorded 24 hours of octopus footage in 20. The authors wrote: 'Wild octopuses project various kinds of material through the water in jet-propelled ‘throws,’ and these throws sometimes hit other octopuses. ![]() It expels water through the siphon by contracting the mantle, and releases its held debris so it is projected through the water Right: The octopus brings its siphon down under the arm web and between the rear arm pair. Its mantle is inflated ready to project water through its siphon. Left: Octopus holds shells, silt, algae or a mixture in its arms while preparing to throw. Illustration showing how an octopus throws material.
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