Which insect is known to emit a foul odor when crushed?

Cinch bugs are known to emit a foul odor when crushed due to the presence of certain chemicals in their body. These insects produce a defensive secretion that not only serves to deter predators but also has a distinct and unpleasant smell, which can be identified when they are crushed. This odor is a form of chemical defense, helping to protect cinch bugs from potential threats in their environment.

In contrast, while fleas, ants, and termites have unique characteristics, they do not produce a similar foul odor upon being crushed. Fleas are known more for their jumping ability and their role as parasites, ants have a diverse range of species with various behaviors and defense mechanisms, and termites are recognized primarily for their wood-destroying habits. However, none of these insects have the distinctive and unpleasant smell that occurs with crushed cinch bugs, making them unique in this aspect.