Here's a very entertaining blog posts about how entomologists in Peru 'make bait' to attract dung beetles for them to study.
Imagine the scenario: dung is thin on the ground (literally) - we find no monkey dung, no big cat dung, in fact no dung other than dog-poo with which to entice those most industrious of organic recyclers, the dung beetles (sub family Scarabaeinae) in to our collecting pots. There is nothing else for it but to 'make' our own. Now, amongst entomologists this is common practice - perfectly normal, honestly, it is!
I couldn't do it.
Link via Bug Girl's Blog.