Tree swallow (Tachycineta bicolor) September 12, 2019 2321 × 1658 Tree swallow (Tachycineta bicolor) Tree Swallow (Tachycineta bicolor), August 2019, Napeague. “Staging” for migration. Breeder. August, 2019. Napeague, Long Island. Grasslands. Will feed over water. Migrant and breeder.