In the beginning I fed in a cardboard box. The snake definitely knew what was coming because he would hold his neck and head in the air looking at me in a striking position. That snake could actually catch a mouse in mid-air if I tossed it in.

Now it could be that the smell of the box could have triggered the feed response, or it could be the snake recognizing the box and knew what was coming. Either way, I had a better feed response in that box than I do in the enclosure. Though with multiple snakes, it's a pain. So I just scent the area.

Now for the original post, I have a snake that will eat like that also. Of course I prefer him to constrict. Like Spaniard says, as long as he eats I'm content.