Oecophylla longinoda, the tailor ant, is fiercely territorial. Here they have pinned down a Polyrhachis intruder that has stumbled onto their tree. St. Lucia, KZN, South Africa

Minor workers of Pheidole spininodis (left) and Pheidole bergi lock mandibles in a fight between competing colonies. Jujuy, Argentina

Pheidole megacephala minor workers kill prey by holding it down and pulling it apart. Here, they attack a driver ant (Dorylus) worker that has strayed too close to their nest. St. Lucia, KZN, South Africa