Yup. The rats that I grow and freeze can always be refrozen and heated up again no problem but the frozen rats that I buy online do not seem to have this shelf life. I feed late at night. If there is no strike I lay the rat beside the hide. Sometimes they take it but sometimes they do not. Some rats will be okay looking in the morning and some will be really gross. Gross ones get tossed into the woods and okay looking/smelling ones get a hair drier to the nose and offered to another snake.