Tree Swallow (Tachycineta bicolor) August 6, 2020 2560 × 1709 Tree Swallow (Tachycineta bicolor) Tree Swallow (Tachycineta bicolor), May 2018, Oceanside. Breeder. May, 2018. Oceanside, New York. Lakes, ponds, marshes, fields. Breeder. Will nest in boxes set up in both wet and dry grasslands.