Octopuses hunt by 'tasting' with their suckers
Nature Podcast
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The Octopus and Squid's Different Predation Strategies
Octopus uses a chemo-tactyl sense, which combines sensation of chemicals with tactile sensation or touch. The types of chemicals that they're actually able to sense are very hydrophobic molecules - things you would not find in the water column in a marine environment. So it makes sense that they would have to physically touch them. This clarified picture of the molecular mechanism behind taste-by-touch helps explain some of the Octopus's unique behaviors.
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