Wednesday, March 12, 2008
Barn Swallow, Tree Swallows
Contrast this with our experiences of Tree Swallows, who we see wintering and migrating in impressively large flocks, sometimes numbering in the thousands. Perhaps this difference in migration strategies has to do with these different swallow species food sources. In winter, Tree Swallows eat insects but especially Bayberries, and in the south, Wax Myrtle berries. The advantage of traveling in a large flock is that you have many eyes to search for the erratically located berry bushes. We have seen Tree Swallows in FL find a patch of Wax Myrtle and descend like a cloud, then gobble 'til the berries are depleted. During breeding, Tree Swallows eat insects, just like Barn Swallows.