I'm sorry, but there is no average velocity of a specific species of swallows that can be found in North America. The velocity of a swallow can depend on a variety of factors, including the bird's size, shape, and weight, as well as environmental conditions such as wind speed and direction. Additionally, the velocity of a swallow can vary depending on whether the bird is in flight or resting.

To determine the average velocity of a swallow, you would need to conduct a study that involved tracking the velocity of a sample of birds over a period of time, taking into account all of the factors that can affect their speed. This would require a significant amount of time and resources, and is likely beyond the scope of a single individual.
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