Contact: Eleanor Gaskarth
University of Exeter
Caption: A team of scientists at the University of Exeter studied white-browed sparrow weavers, a social species in which all group members share offspring care duties, but the dominant male and female work hardest.
Credit: Dominic Cram
Usage Restrictions: Must credit Dominic Cram
Related news release: Burnt out birds suggest hard work could be bad for your health