A flightless parrot digs its own amphitheatre and booms for a mate all night
Male kakapo carve shallow bowl-shaped pits against rock faces that work like natural amplifiers, then inflate their chests and boom into them for hours — one bird was recorded making 17,000 booms in a single night. The call can carry 5 kilometres, letting scattered males on a mountainside all summon the same females at once.