I would like to know as I want to contribute to a biodiversity project that wants to create a database with ant feature measurements. I'm not sure if I like the idea of killing ants however (even though it's just a single ant with limited ability to suffer, I know) so I'm looking for a way to immobilize ants long enough to take some detailed measurements but without having to kill them or harm them permanently.
Related question: how could I clean the ant so that it's not marked with the chemical used in the perception of other ants?
I know that for the database they may require keeping the specimen (and therefore killing it) in the name of science so that it can be checked by others but I'm more concerned with the question whether in principle these measurements could be taken without permanently harming the ant and how this could be done in practice.
Thank you for your help!