These beetles are some of the world’s largest insects. Although they are nocturnal, they are attracted by light. They have been known to fly into a campfire, emerge unscathed and fly straight back in again!
Thanks to a physiological process, they are among the only beetles to be able to change the colour of the elytra almost instantaneously. The wetter it is, the darker they are, and the drier it is, the lighter yellow they turn. They also adjust the humidity level in the space between their elytra and abdomen as a way of controlling their body temperature.