Broody octopus keeps record-breaking four-year vigil

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For four years and five months, she clung to the rock and guarded her eggs. In a feat that surely made good use of all eight arms, an octopus revealed a new secret of deep sea life when ecologists observed her record-breaking behaviour from a robotic submarine. This doubles the longest brooding time ever seen in the animal kingdom, giving embryos time to develop in the cold.

http://www.bbc.com/news/science-environment-28545964

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