The last two feedings I've givin it adult mice and they went down with no problem and left no lump in it. Well I found out that rats are better for them and as soon as I can switch to feeding rats. So I got a small rat and it was huge compared to the adult mice. Longer, thicker all that. I was kinda thinking that it was a long shot for it to get the rat down. Well after waving it front of the sanke he struck at it and about half hour later he got it down. There was and still is a huge lump in the middle of the body. I think though I'm gonna wait about two weeks before the next feeding because I don't want to over do it. I'll get some pics next time.