Inside a nest of Liometopum apiculatum workers have piled developing brood up under a sun-warmed rock. Heat accelerates the process of metamorphosis. Portal, Arizona, USA

Liometopum apiculatumLiometopumdolichoderinaeformicidaevelvety tree antshymenopterainsectssocial insectsant broodant developmentant nestlarvaelarvapupaeant colony