By April, spring migration is in full swing. Birders eagerly await the “first of the year” bird sightings at their favorite birding spots. We have kept track of yard birds for over 20 years at our property. We feel a rush of excitement and joy when we see and hear the first Tree Swallows fly down to our bird boxes each spring. The same is true for the first Rufous Hummingbird and Turkey Vulture sightings. Part of our amazement is the realization of how far the birds have travelled since we saw them last in the late summer.