Here, you can post a list of the species that can cross a certain barrier on foot that you use, or have experimented with.
By of foot, I mean that without building a debris bridge, or piling each other up to get across. I mean a single ant can just walk over it.
Some common barriers are:
List of species that can cross barrier.
List of species that refuse to cross barrier, or have tried and failed.
Edited by Gregory2455, November 2 2014 - 11:30 PM.