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They were paging through a binder of listings, checking off the day’s sightings, including the northern beardless tyrannulet and greater pewee.

The impacted species include blackbirds, flycatchers, sparrows, swallows, warblers and the western wood pewee.

“What makes pewee soccer particularly insidious is that boys and girls play together,” he wrote.

The migrant wildlife is gone, the pewees, vireos and wood thrushes all far to the south by now.

“There’s your eastern wood pewee,” he says with excitement, steadying the laser on the tree trunk next to the sitting bird.