I'd say wait a couple of days and the next time you offer, as whiSKi08 mentioned, make sure the prey is nice and warm before you offer it. once mine are thawed, I put them (in a Ziploc baggie) submerged in a bowl of the hottest tap water I can get, for a few minutes. when I take it out of the water, and out of the baggie, it's pretty warm. Never had an issue.