Stereopsis

When she becomes dominant her body changes so that she becomes physiologically and morphologically distinct from other non-reproductive female ‘workers’, even her bone structure changes. Mole-rats were thought to be the only mammal to do this, but it has since been discovered that female meerkats also develop elongated vertebra when they become dominant breeders. As well as reproductives, there are also physically and behaviourally distinct dispersive morphs, only known since 1996. Dispersers are big, fat males that try to mate with strange animals from other colonies instead of attack them, as most mole-rats would do. These dispersers are very rare, however, and have never been seen above ground.