I work at a small mom and pop pet store, and one of our Madagascar Swifts has been having muscle spasms. It's been almost seizure like at times, even. As far as I'm aware he is eating, because the bugs are disappearing, and he has fresh water at all times. I'm not entirely sure how long he has been here, but this is a recent development. Any ideas what could be causing this? Our other swift hasn't had any problems, and they came in together.