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Mud-rolling mud-dauber by Georgina Steytler, Australia — winner, Behaviour: invertebrates. It was a hot summer day, and the waterhole at Walyormouring Nature Reserve, Western Australia, was buzzing. Georgina had got there early to photograph birds, but her attention was stolen by the industrious mud-dauber wasps. They were females, digging in the soft mud at the water’s edge, then rolling the mud into balls to create egg chambers for their nearby nests. A female builds her external nest completely out of mud, cylindrical chamber by chamber, which cement together as the mud hardens. (Photo by Georgina Steytler/2018 Wildlife Photographer of the Year)
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