Meet the bowerbirds that spend months building elaborate displays decorated with flowers, feathers and shells to win a mate

Deep in the forests of Australia and New Guinea lives a bird that behaves less like a builder of nests and more like an obsessive art collector. The bowerbird spends months gathering flowers, feathers, shells, berries and whatever human litter it can find, from bottle caps to broken glass, then arranges every piece with startling precision. This is not a nest for eggs. It is a stage, built purely to seduce a mate. Some species favour a single colour above all else, others sort their treasures by size to create optical illusions, and a few steal from their rivals outright. What results is one of the strangest and most sophisticated courtship displays in the animal kingdom, one that has captivated scientists and birdwatchers alike for decades.