Cockroaches have different tempers

In 2015, a group of Belgian scientists showed that a cockroach’s personality determines whether it will leave a hiding place, when its peers do so, or wait. As cockroaches thrive with company, the scientists created 19 teams of 16 creatures, subsequently observing for how long the teams remained in a hiding place. The experiment showed that while some teams were in no hurry, others left faster. Individual teams boasted the same behaviour during all experiments, showing a consistent "personality".