Do crows fly in a straight line?

It is commonly believed that the crow flies forward in a straight line. Hence the phrase as the crow flies, meaning in a straight line from starting point to the objective or place of destination, irrespective of buildings, rivers, roads, hills or any obstacles that might make the distance greater if a person were to travel it on foot or by vehicle. The saying, however, is the result of careless observation, for the crow does not usually fly forward in a straight line but zigzags considerably. Sometimes the shortest and quickest route from one point to another is called a beeline, referring to the fact that a bee flies in a direct or almost direct line when seeking its hive. The Bee Line- Highway is a thoroughfare connecting Kansas City, Missouri, and Canon City, Colorado, being the shortest ground route between those two points.