Male bowerbirds prefer colorful human items to decorate bowers

Male bowerbirds are well-known for their elaborate courtship rituals, which involve building intricate structures called bowers from twigs. These males then adorn their bowers with a variety of colorful items sourced from their surroundings. When a female approaches, the male showcases his most dazzling treasures while flaunting his plumage to attract her attention. Recent research published in the journal Royal Society Open Science by scientists from the University of Exeter has revealed that urbanization and the resulting availability of vibrant human-made objects significantly influence the courtship behaviors of Australian male bowerbirds. The study highlights notable differences in the types of decorations used by bowerbirds in urban areas compared to their rural counterparts. Urban bowerbirds have a greater access to colorful items, which leads to a marked preference for these human artifacts over natural materials. The research team observed the bowers of 61 male great bowerbirds across two distinct locations in northern Queensland, Australia—one in the rural Dreghorn Cattle Station and the other in the urban setting of Townsville City—during the peak breeding season from September to December 2023. To capture the variations in decoration, researchers photographed the bower displays from above using both visible and UV light, as bowerbirds can perceive ultraviolet light. They focused on the ten decorations closest to the entrance of each bower, as these are the items most likely utilized during courtship displays. After documenting the original sources of these decorations, the researchers removed all existing items from each bower and created a mixed collection of decorations from both urban and rural sites, leaving the area undisturbed for three days. Importantly, none of the males were presented with items from their own bowers, ensuring the integrity of the experiment.