I suspect that after awhile, smells that are just sort of always there in the background get tuned out and ignored. That seems to be basically necessary for everyone at some point, animals as well as humans, because we can't just be constantly on high alert all the time on account of information whose relevance doesn't pan out. The snakes might react at first, but after awhile the smell of the rabbit will just be the normal background of the room they live in. They'll have no problem picking out the smell of a feeder you serve them.
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