Phobaeticus kirbyi is species of stick insect native to Borneo. It is one of the world's longest insects. The holotype deposited at the Natural History Museum in London measures 32.8 cm (12.9 in) in body length and 54.6 cm (21.5 in) total length, including extended legs. This makes it the third-longest known insect in terms of body length, behind the stick insects Phryganistria "chinensis" (an informal name for a currently undescribed species) with 36.1 cm (14.2 in) and Phobaeticus chani with 35.7 cm (14.1 in). P. "chinensis", P. chani, P. serratipes and Ctenomorpha gargantua exceed it in total length with legs extended (no body lengths of females have been published for the last two, making it unclear if they also surpass P. kirbyi in this measurement). Recent specimens of P. kirbyi have only reached 28.3 cm (11.1 in) in body length.
