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Nature 438, 929 (15 December 2005) | doi:10.1038/438929a; Published online 14 December 2005

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Post-spawning egg care by a squid

Brad A. Seibel1,2, Bruce H. Robison1 & Steven H. D. Haddock1

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Spying on a brooding deep-sea squid reveals that it cradles and aerates its eggs while they mature.

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Gonatus onyx is one of the most abundant cephalopods in the Pacific and Atlantic Oceans1 and is an important prey species for a variety of vertebrate predators2, 3, but a full understanding of its life history has been hampered because spawning occurs at great depths4, 5, where observation is difficult. Here we describe post-spawning egg care, or brooding, in this deep-sea squid. Our finding is unexpected because this behaviour differs from the reproductive habits of all other known squid species.

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