Brunneria borealis, commonly known as the northern bush katydid, is a distinctive insect found primarily in the temperate regions of North America. This katydid is characterized by its elongated body, which can reach lengths of up to 3 centimeters. Its coloration typically ranges from bright green to brown, providing excellent camouflage among foliage. The wings are long and narrow, often extending beyond the body, and exhibit a mottled pattern that aids in blending with its environment.

The northern bush katydid has long, slender antennae that can be several times the length of its body, enhancing its sensory perception. Males produce a series of melodic calls during the mating season, which are crucial for attracting females. These calls are created by rubbing their wings together, a behavior known as stridulation.

Brunneria borealis typically inhabits shrubby areas, grasslands, and forests, where it feeds primarily on leaves and tender plant material. Its life cycle includes several nymph stages, leading to adulthood in late summer or early fall. This species plays a vital role in its ecosystem, serving as both a herbivore and a food source for various predators.