From John J. Collins:
“I went to Loantaka Brook Reservation this morning and saw the Little Blue Heron (it was perched low in a tree preening itself). There were also two Blue-winged Teal (male and female) present on the pond. Then I went to Lord Stirling Park and walked the fisherman’s trail to the observation tower where I observed a stunning Prothonotary Warbler!”
[Editor’s note: The Little Blue Heron is at Loantaka for 10 days; the Blue-winged Teal for 2+ weeks. Yesterday, Apr. 20, Tom Justesen reports a Red-headed Woodpecker near the fenced-in pond at Loantaka].
4 Bonaparte’s Gulls were seen at Budd Lake early this afternoon (Alan Boyd). Photos are at Alan’s Flickr site.
The Yellow-throated Warbler is at Colonial Park for the 8th day (Zach Batren).
mocosocoBirds 
Saw the yellow-throated warbler today at parking lot A and it was carrying nesting material.Thanks for the heads up!
I observed the Cliff Swallows at the Route 202 bridge over Boonton Reservoir yesterday (4/21) late afternoon between 6:45 and 7 PM. Please check the reservoir for a Red-necked Grebe if you go; I saw a sleeping bird which I am almost certain was one, but it never lifted its head to confirm the ID.
The Yellow-throated Warbler was singing loudly at Colonial Park this morning, Tuesday 4/22, in and around Parking Lot A on the west side of Mettler’s Lane. This was between 8:15 and 8:35 AM.