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“You have just heard the sound of a brown creeper and a common yellowthroat!” he told us.

The common yellowthroat, a warbler of the wetlands, can be surprisingly difficult to see due to its bright gold throat and upper breast.

Ditto the male common yellowthroat, whose black eye mask is unlike that of any other warbler.

Birds such as the black-throated blue warbler, common yellowthroat and ovenbird were among the dead during the mass bird strike event last year.

Common yellowthroats, white-throated  sparrows, gray catbirds and ovenbirds are the most common victims in Philadelphia, experts said, and those species are also threatened by climate change and other predators.