A Northern Saw-when Owl was in Central Park today.  It may be an owl that over wintered in the park or a migrant.  I was surprised to see one so late in the year.  But I looked up the frequency of Northern Saw-when Owl sighting over the last twenty year in Manhattan on eBird.org, I discovered Northern Saw-when Owls are seen until mid-April, with late March being a peak period for sightings.