Octopuses Use Their Tentacles to Feel Light

Tentacles that think — Francisco Blaha

Octopus - Wikipedia

Clever octopus is a brilliant, but puzzling, loner of the sea

Taking a lesson in evolutionary adaptation from octopus, squid

The Octopus Show, Sea Chameleons, Nature

Severed Octopus Arms Have a Mind of Their Own

From above of fresh uncooked octopus with head and tentacles

For an Octopus, Seeing the Light Doesn't Require Eyes - The New

Choosing and Keeping a Pet Octopus