We came home from work today and as soon as he saw us come in the room Sleipner lept off a rock and swam to the glass to meet us like a lonely puppy. When we put our hands in he reached out to them with his arms and was happy to entertain us with a little tug of war session. I picked up an Oregon crab that seemed very recently deceased and slipped it into his arms. He engulfed it and is happily munching on it as I type. While we've seen a bit more of him over the past week as he switches dens more often and will once and a while be out on the rock or glass, but this is the first social behavior he's shown since a couple days after arriving. I know he's been eating snails over the past few days as I did a detailed shell inventory, and while searching the tank for him yesterday I saw an arm reach out of a hole and drop an empty shell onto the sand below. Here's a picture I took the other day. He's got two little knobs on the "forehead" of his mantle above his eyes.