The tree swallow is larger, entirely greenish blue ... 4–6 eggs (April–May). Migration: in spring, arrives in southern Arizona and southern California by late February, Alaska by early May.

The paper makes the case for human-assisted tree migration because rapid warming from climate change is likely to outpace regeneration. "One of the potential issues is that we may get bigger and ...

They are a long-distance migrant that can be seen at many spring migration hotspots across ... beetles and wasps. Tree swallows have a more varied diet. Barn swallows skip most feeders, including ...

In a sure sign that spring is near, the first Purple Martins of the year have been spotted in South Carolina. The birds were seen on Feb. 1 in Hanahan ...