The gunk on the beak of this satin bowerbird (Ptilonorhynchus violaceus minor) is plant matter, which he mashed up to paint his bower's inner sanctum in a rain forest in Queensland, Australia.

这只缎蓝园丁鸟(Ptilonorhynchusviolaceus minor)嘴上粘粘的东西是种植物。在澳大利亚昆士兰的雨林里，园丁鸟把这种植物涂在他们的巢穴最里面的密室里。