I let the rodents "air" thaw. Then I throw them into the "hot box" until there nice and warm, around 100 degerees. I started using hot water years ago. Decidied I must not like "rat soup" and then went to the "air" thaw, warm with a hair dryer method. I even made a hairdryer holder from a clamp for a dome light, but as the collection grew this became way to time consuming and not very energy efficient. So I decided to make a "hot box".
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Works great and could easily be scaled up for larger collections.
Anthony