What is a common characteristic of bark beetles?

Bark beetles are commonly associated with fungi as part of their life cycle and feeding behavior. These insects often carry fungal spores with them when they bore into trees. The fungi can help the beetles by breaking down the wood, making it easier for them to feed. Moreover, many species of bark beetles have a mutualistic relationship with specific fungi, such as blue-stain fungi, which not only provide nutrition but also help in overwhelming the tree's defenses. This association is significant because it contributes to tree mortality, affecting forest health and management practices.

The other options may describe traits seen in different insects or certain pests, but they do not accurately characterize the unique relationship that bark beetles have with fungi, which is a defining feature of their biology and ecological impact.