The navigation issue is really interesting , but I just couldn't suppress my chuckles every time I watchd one of the little guys (gals) zipping straight back towards the nest entrance.
Ha! I show this clip every year during the 'Navigation' unit of my animal behavior classes. :) it never fails to impress.
Ah!! I am glad I have found out who "Alex" is. :) You have some terrific pics here Alex.
Your Pasimachus is almost as bad as our manticore...
Interesting info on the formicine species being found here in SA too. I must go and look up where they are found and see if I can find some to take pictures of.