Keeping things in Australia for another day, this is a male regent bowerbird, photographed in Lamington National Park in Queensland. Male bowerbirds build elaborate structures on the ground, known as bowers, to attract females. They will line these bowers with sticks, shells, leaves, seeds and berries. They will also sometimes use wads of leaves as paintbrushes to spread a saliva paint to spruce up the place. This makes them one of the only known birds to use tools.