The airspeed velocity of an unladen swallow is roughly 20.1 miles per hour (32.4 kph) or 29.5 feet per second (9 meters per second). This is based on the average wingbeat frequency and amplitude of a European swallow. However, the actual speed can vary depending on the species of swallow, the wind conditions, and the weight of the swallow. For example, a swallow carrying a coconut would be significantly slower than an unladen swallow.

The question of the airspeed velocity of an unladen swallow is a famous one from the movie Monty Python and the Holy Grail. In the scene, King Arthur and his knights are crossing a bridge guarded by two executioners. The executioners ask Arthur three questions before they will allow him to pass. One of the questions is "What is the airspeed velocity of an unladen swallow?" Arthur is unable to answer the question, and the executioners chop off his head.

While the question is a humorous one, it is also a legitimate scientific question. The airspeed velocity of a bird is important for understanding its flight behavior and ecology. For example, the airspeed velocity of a swallow can help scientists to determine how far it can migrate and how much food it needs to survive.

In addition to the European swallow, there are many other species of swallows. Some of the fastest swallows include the white-throated needletail (Mach 1.8), the common swift (68 mph), and the barn swallow (20 mph).
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