Which characteristic is typical of the American cockroach?

The American cockroach is commonly found in environments that provide warmth and moisture, making commercial kitchens an ideal habitat for its survival. These areas offer food sources and suitable conditions for breeding. The presence of the American cockroach in such environments can lead to health risks and contamination, as they are known to carry pathogens.

Regarding the other characteristics, while the American cockroach does exhibit spines on its legs, they are not non-visible; rather, they are quite prominent. It is also not the smallest domestic cockroach; that title is often attributed to other species like the German cockroach. Additionally, although the American cockroach is capable of flight, its flight behavior is not specifically from low to high places as described, but rather more generalized and often depends on environmental conditions. Thus, the characteristic of being found in commercial kitchens accurately describes the typical presence and behavior of the American cockroach, justifying its selection as the correct answer.