Cockroaches can team up. A South American species is the first cockroach known to live in group nests, with workers and a queen – like honeybees or leaf-cutter ants.

“All cockroaches are solitary,” says Peter Vršanský at the Slovak Academy of Sciences – or so everyone thought. “It’s unbelievable. It’s like discovering ants as a group.”

Animals like honeybees are eusocial – not only do they live in large groups and work together to tend the young, but most individuals do not themselves reproduce. Worker …