Yes, butterworms have an odd smell, don't they? A quick sniff is not unpleasant but more than a moment and it's a bit much. These are caterpillars of a moth form Chile and they are serious wood borers! They should ONLY be cup or hand fed for the reason you mention. You will see them next as the moth and if a male and female find each other you may have lots of baby butters!Heika said:I bought some butter worms not too long ago. They burrowed into the wood at the base of my cage. Plus, they stink. I am much less impressed with them now as when I was reading about them.