“I was much interested, on several occasions, by watching the habits of an Octopus or cuttle-fish.
Although common in the pools of water left by the retiring tide, these animals were not easily caught.
They darted tail first, with the rapidity of an arrow, from one side of the pool to the other, at the same
instant discolouring the water with a dark chestnut-brown ink.”—Charles Darwin, The Voyage of the
Beagle (1839).