Tree Swallow (Tachycineta bicolor) October 15, 2018 640 × 427 Tree Swallow (Tachycineta bicolor) Tree Swallow (Tachycineta bicolor), May 2011, Oceanside. Breeder. May, Oceanside, New York. Lakes, ponds, marshes, fields. Breeder. Will nest in boxes set up in both wet and dry grasslands.