Raptors included two Red-tailed Hawks and three Northern Harriers. I did not see any of the other grasslands specialist birds of prey that sometimes reside in the park or surrounding landfills during the winter. Songbirds included a few Yellow-rumped Warblers (rare in December in Bergen County, according to eBird) and American Tree Sparrows. I also saw and heard one Belted Kingfisher.
I realized after I looked at my photos that this Northern Mockingbird is wearing a federal band on its right leg. Unfortunately I was not able to read the inscription in any of my photos. I probably would not have been able to read it through binoculars either, even if had noticed the band at the time of the sighting.