The deep-sea Dumbo octopus was spotted a mile below the surface of the Pacific Ocean, close by an unnamed seamount in the Papahānaumokuākea Marine National Monument.

Deep-Sea Octopus (Graneledone boreopacifica) Conducts the Longest-Known Egg-Brooding Period of Any Animal. PLOS ONE , 30 Jul 2014 DOI: 10.1371/journal.pone.0103437 Cite This Page : ...

Researchers at the Monterey Bay Aquarium Research Institute have observed a deep-sea octopus brooding its eggs for four and one half years -- longer than any other known animal. This amazing feat ...