Many ant colonies keep guards posted at their nest entrances. This Camponotus ephippium ant's head is nearly the same size as the nest entrance, forming a plug that she will only move to let her nestmates come and go. Victoria, Australia
A carpenter ant visits an extrafloral nectary on a leaf stem of an invasive Melia azederach tree. Austin, Texas, USA.
A small carpenter ant gathers nutrients from bird feces. Chattanooga, Tennessee, USA.
