At an aquarium in Coburg, Germany, an octopus named Otto was known

Inky the Octopus Escapes From a New Zealand Aquarium - The New York Times

New Octopus at VIA Aquarium Needs a Name, The Daily Gazette

Inky's Daring Escape Shows How Smart Octopuses Are

Everything Octopus: March 2009

The magical master in the ocean, why is the IQ of the octopus so high? – metalkitor

Octopus Intelligence Shakes Up Darwin's Tree

Another Path to Intelligence - Nautilus

File:Octopus in Blue Reef Aquarium Newquay (5852).jpg - Wikimedia Commons

Paul, the WCup predicting octopus, dies at 2 1/2 - The San Diego Union-Tribune

FNZAS Aquarium World May 2013 by FNZAS - Issuu

Clever octopus: Inky's mates have got previous - BBC News

Otto the Octopus has that weekend feeling! 🐙♥️ We are open every day 9am - 5pm, Last admission 4pm

The magical master in the ocean, why is the IQ of the octopus so high? – metalkitor