What is a common characteristic of cave or camel crickets?

Cave or camel crickets are known for their tendency to create habitats in dark, damp areas such as caves, basements, and under stones, where they often reside in large groups. One characteristic that sets them apart is that they do not have wings and are not capable of flying, which rules out the flying capability often attributed to other cricket species.

Additionally, these crickets are often confused with other pests due to their appearance and the environments they frequent. While they don't typically leave stains on foundations, they do have the ability to feed on organic materials, sometimes leading to the presence of droppings or molted exoskeletons, which can create a nuisance.

However, the correct characteristic of cave or camel crickets is that they are nocturnal, meaning they are primarily active during the night. Their presence is usually indicated by their activity in the dark, making them challenging to spot during the day. The option that suggests they leave stains is not accurate because cave crickets do not have the behaviors associated with damaging structures in that way. Instead, they are simply living in an environment that might appear messy due to their droppings or nesting locations.