I feed my ribbons live guppies, placing them on the substrate so that they jump around and attract the snakes. I put the fish in in twos, one next to Percy and one next to Luke. The other day when I fed them, I had been getting frustrated (Percy is going through a phase where he feels he must eat each fish tail first, which takes forever), so there was a fish already on the ground when I gave him his next (sometimes the flopping of a new fish will start the old ones flopping too). Percy grabbed the new fish and had it halfway down when the first fish started moving. He rushed over and pinned it down with his chin, then, realizing that that wouldn't work for long, he pulled back his head and flung part of his body onto it. He finished his fish, then grabbed the other and ate it leisurely, lifting his body to release it little by little as he ate it.