Cracker, Hamadryus sp.
These amazing butterflies are named for the sound the males make when they erupt into flight from their perch. on a trunk. It is not well understood why they make the noise, but it may be a territorial/aggression behaviour or courtship behaviour. Their cryptic coloration helps them to camouflage during the day where it rests head downwards on tree trunks. All Hamadryas have a dome-shaped membrane that acts as an ear. A second smaller ear has been shown to detect bat radar.