A newly hatched Queensland Titan stick insect, Acrophylla wulfingi. The Queensland Titan is one of the world's largest stick insects; an adult may reach 30cm in length. Stick insects are active by night, & during the day remain stationary in imitation of the twigs & leaves which they closely resemble. This type of imitation of plants is called phytomimesis. Stick insects are also able to change colour by day & night, a process controlled by hormones.

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