It has been pointed out to me by several people that Horned Grebe has been seen several times this year. Since it takes awhile for "rare" records to get reviewed they won't appear on the eBird map but I found that if there is a photograph of the sighting you can see them in the Macaulay Library.
Here's the link: • Macaulay Library: Horned Grebe (Jan/2018) for all sightings including unconfirmed <https://search.macaulaylibrary.org/catalog?taxonCode=horgre&yr=YCURRENT&mr=MCUSTOM&mediaType=p&sort=obs_date_desc®ion=New%20York,%20New%20York,%20United%20States%20(US)&emo=1®ionCode=US-NY-061&includeUnconfirmed=T&q=Horned%20Grebe%20-%20Podiceps%20auritus> There's a way to get to this via eBird directly but I use the NYS eBird Hotspots wiki page for New York County. It's set up to view 'All Images' for any county on the site. You can change the filter to a specific species or timeframe. It's on the 'Illustrated Checklist' line after 'Macaulay Library' above the Bar Chart tables by month. • Wiki page for NYS eBird Hotspots: New York County <http://ebirding-nys.wikispaces.com/New%20York> -- Ben Cacace Manhattan, NYC Wiki for NYS eBird Hotspots <http://ebirding-nys.wikispaces.com/Birding+in+New+York> Facebook Discussion for NYS eBird Hotspots: Q & A <https://www.facebook.com/groups/NYeBirdHotspots/> -- NYSbirds-L List Info: http://www.NortheastBirding.com/NYSbirdsWELCOME.htm http://www.NortheastBirding.com/NYSbirdsRULES.htm http://www.NortheastBirding.com/NYSbirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/nysbirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/NYSBirds-L 3) http://birding.aba.org/maillist/NY01 Please submit your observations to eBird: http://ebird.org/content/ebird/ --