It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
"There's one species of ant with a big flat head," she said. "It blocks the entrance to the colony. It plugs that hole, but if it gets the right message, it unblocks the hole. Other forms are specialized for defense, construction and raising larva, and they each have physical features that are suited to those roles."