One of my two Grays (P-nut the male) was sitting on a big leaf in his tank..Thought it would be a good time to give him a wax worm as a treat.. I dropped the worm close to him..he did the usual head turn..took a step or two closer..stared at it..(like usual)...The proceeded to croak at it twice before he ate it..I've never seen him do that before..It was really funny..