can tree swallow and violet green swallow nest close together
1 Violet-green Swallows are closely related to Tree Swallows, and migrate early, often in the company of Tree Swallows. 2  Violet-green Swallows live in the western states and provinces, and nest all the way up into Alaska and the Yukon, as Tree Swallows do. They weigh about 16.4 to 22.2 grams, or 1/2 to 3/4 ounce, and are 5 to 6 inches long. 2  The oldest Tree Swallow that was banded and later recaptured was 12 years 1 month old. 3  Violet-green Swallows are closely related to Tree Swallows, and migrate early, often in the company of Tree Swallows.