Well I thawed the rat in the hottest tap water that I could get for about 22 minutes, replacing the water twice. I had no problem with splitting this time, but I am still having a problem with my snake finding the head of the rat, I read that this could be because the head is too cold, I tried heating the head up more than the rest of the body but he still took 15+ minutes to find the head after trying to eat it from the tail. Any ideas why this is?