Tree Swallows nest in cavities . . . old woodpecker holes in trees, or nest boxes. They do not go far south in winter; they return to Minnesota before any other swallows. They can eat plant foods, so they can survive before the insects come out. In the nest box near the pond, the Tree Swallow laid one egg each day in the last six days. She started incubating the eggs today. They will hatch in 11 to 20 days.
And the Tree Swallow male stands by to guard the nest while the female incubates the eggs.
