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Over the summer, expect to see goslings learning how to fly, blue-winged teals migrating south, and kingbirds and flycatchers gorging on insects.

As golfers practice their putts, Rachman spots a trio of Cassin’s kingbirds perched at the top of a tall sycamore tree.

The holes in its interior plaster walls now make homes for barn swallows and western kingbirds.

On a recent morning, Simons stood sipping from a steaming cup of coffee and noticed an eastern kingbird carrying something wiggly in its beak.

Populations are increasing for species whose preferred habitats are in sync with the changing conditions, such as Cassin's kingbird, a southwestern native now expanding its range as Colorado and Wyoming warm up.