This one was not twitchingI only know that because I grabbed the tail and tried to pull it back out because it scared me when it started moving. ( I know that was probably stupid but I had been drinking a little bit) but it started squealing that's when it really kind of freaked me out. And I usually don't feed when I have been drinking but I had already missed my feeding day by two days for my other ball I've had for about 3 months now. so I didn't want to wait another.