Length: 6 in.
Wgt.: 19-21 g,
Main prey items are aquatic insects and invertebrates, some small flying insects.
One Clutch per season, 3-6 eggs per nest, nest building by both sexes with incubation by females; incubation about two weeks and young leave nest in about 10 days; common cowbird host.
Known to live 8 years
Likely many killed from collisions with towers, tall buildings and other structures during migration. Deforestation on wintering grounds is increasing, and water pollution on breeding and wintering grounds impacts macro-invertebrates it feeds on. Increased water flow rates in suburban streams likely impacts nesting attempts. Increase in mammalian predators like raccoons may cause problems, and feral cat populations continue to grow.