For snakes on feeding strikes ...
Cut off the tail of a frozen rat, thaw it out, and wave it around to check interest. The past two times I've thawed live rats he was not interested at all. In fact he withdrew further and hid his head. This been going on for a few weeks.
This time with the tail, he immediately came out of his hide, sniffed the tail (seemed a bit confused, but interested) and is now looking around all over the enclosure for the missing rat. This is the most interest I've seen since he went on his strike.
(I gave the tail to my ratsnake and she is now sniffing it all around, very interested but not sure where its head is!Update: she ATE it!Good snakey!)