ants playing dead

The European species of Formica exsecta seek to colonize other species of the Formica genus. The exsecta queen is smaller than other predatory species ...and thus tends to be treated with less hostility by the host workers. 'Queens approached by the host workers lie down and 'play dead' by pulling their appendages into the body in the pupal posture. In this position they are picked up by the host workers and carried down into the nests without any outward show of hostility. Later they somehow manage to eliminate the host queen and take over the reproductive role'