My Messor barbarus don't climb much but only because they don't really want to, they tend not to bother climbing rough surfaces (unless there are seeds on top, or insects

).
After all they are only supposed to collect seeds and insects on the ground and don't need to find aphids etc in trees.
Some times they go for a walk on the glass but they are soon stopped by PTFE. I have thousands of workers in my 2 year old colony but I never have any break outs, they even chase prey up the glass

.