I just gave Checkers a thawed large mouse today and he ate it right up! He had grown up on live when his old owner had him so I was not sure, but I waved it in his tank and he snapped at it so I put him in the feeder box and he devoured it! My baby was hungry! Not sure if it was 100% thawed because it was in my fiance's truck while we went shopping for like 2 hours and it was warm in the truck like 65 degrees or so because we had a wind storm so it is warm outside. We live in Alaska so the weather is odd, and the mouse was squishy. He is in his tank on the heat pad so if his belly is a little cold he won't freeze. Besides he was lost in our home for 2 weeks on concrete floors (only that way till we can afford carpet. So he has been chilly before.