Phalacrocorax brasilianus mexicanus
Status: Rare regular summer visitor east and central
Documentation: Specimen: UNSM ZM14226, 2 Oct 1982 Sutherland Res (Wright 1983).
Taxonomy: Two subspecies are recognized (Gill and Donsker 2017), mexicanus in the extreme southern United States, Caribbean, and Nicaragua, and brasilianus from Costa Rica south throughout South America. Nebraska birds are presumed mexicanus.
A hybrid with Double-crested Cormorant was photographed at Crescent Lake NWR, Garden Co 2 Sep 2020 (eBird.org).
Changes since 2001: Of the 25 accepted records, 20 are from 2000-2020, indicative of increasing drift northward in recent years. Breeding first occurred in Kansas in 2007 (Thompson et al 2011), but as yet has not occurred in Nebraska.
Summer: Mar 31, Apr 1, 4 <<<>>> Sep 23, 23, Oct 2
This species is now essentially annual in occurrence. Earlier dates are 12 Mar 2020 Pawnee Lake, Lancaster Co, 1-2 on 12 Mar-16 Apr 2012 Branched Oak Lake, Lancaster Co (Brogie 2013), 20 Mar 2020 Wagon Train RA, Lancaster Co, 21 Mar-25 Aug 2017 Branched Oak Lake (Silcock 2017a, 2017b, 2017c) and 29 Mar 2018 at Branched Oak Lake, and a later date 26 Nov 2010 Branched Oak Lake (Silcock 2010). Additional early sightings without details are of one in flight with Double-crested Cormorants in Buffalo Co 16 Mar 2012, and one at Branched Oak Lake 26 Mar 1998 (Brogie 1999).
UNSM: University of Nebraska State Museum
Photograph (top) of a Neotropic Cormorant at Branched Oak Lake, Lancaster Co 17 Sep 2018 by Michael Willison.
Brogie, M.A. 1999. 1998 (Tenth) Report of the NOU Records Committee. NBR 67: 141-152.
Brogie, M.A. 2013. 2012 (24th) Report of the NOU Records Committee. NBR: 81: 120-130.
Gill, F., and D. Donsker (Eds). 2017. IOC World Bird List (v 7.3), accessed 30 January 2018.
Silcock, W.R. 2010. Fall Field Report, August-November 2010. NBR 78: 130-150.
Silcock, W.R. 2017a. Spring Field report, March-May 2017. NBR 85: 54-83.
Silcock, W.R. 2017b. Summer Field Report, June-July 2017. NBR 85: 94-120.
Silcock, W.R. 2017c. Fall Field Report, August-November 2017. NBR 85: 146-178.
Thompson, M.C., C.A. Ely, B. Gress, C. Otte, S.T. Patti, D. Seibel, and E.A. Young. 2011. Birds of Kansas. University Press of Kansas, Lawrence, Kansas, USA.
Silcock, W.R., and J.G. Jorgensen. 2020. Neotropic Cormorant (Phalacrocorax brasilianus mexicanus). In Birds of Nebraska — Online. www.BirdsofNebraska.org
Birds of Nebraska – Online
Updated 29 Dec 2020