Warum sind die Insekten in Australien so groß?

Credit: Wheel bug: By Ian Grettenberger, CC BY 3.0: , : CC BY 2.0 : By Mark Dumont: Walking Stick: , Walking Stick 2: , CC BY-SA 3.0 : Australian Walking Stick: By Rosa Pineda, Dryococelus australis: By Peter Halasz, Pengo, WolfmanSF, stick insect: By Granitethighs, CC BY-SA 4.0 : Coscinocera hercules: By Anaxibia,