Indonesian bark scorpions are a group of scorpions belonging to the family Chaerilidae. They are commonly known as bark scorpions due to their preference for living in and around the bark of trees. This genus includes various species distributed across Southeast Asia, particularly in countries like Thailand, Malaysia, Indonesia, and the Philippines. One of the notable features of Chaerilus scorpions is their impressive coloration and patterning. They often exhibit a combination of dark brown or blackish body coloration with contrasting yellow or reddish markings. These markings can vary between species and even within populations, providing a beautiful and distinctive appearance. Indonesian bark scorpions are relatively small in size, with adults typically measuring around 2 to 3 inches (5 to 8 centimeters) in length, including the tail. These scorpions are primarily nocturnal, preferring to remain hidden during the day and actively hunting for prey at night. They are skilled ambush predators, using their well-developed pincers to grasp and immobilize their prey before delivering a venomous sting. These scorpions are typically found in forested areas, particularly in leaf litter, under tree bark, or within crevices of trees. They have adapted to arboreal (tree-dwelling) and semi-arboreal lifestyles, which is why they are commonly associated with tree bark. Some species are also known to inhabit rock crevices or other sheltered locations in their environment.