Documentation of
Neotropic Cormorant
2025-040
Observer Information
Reporter:
Peter Gent
55 S. 35th St.,
BOULDER,
CO 80305-5524
E-mail:
pgent@cobirds.org
Other Observers:
Dan Zmolek, Leslie Sutton, Gwen Robeson and many others.
Species, Date, Time and Location Information
Species:
Neotropic Cormorant
First Date/Time:
10/11/2025 2:00:00 PM
Last Date/Time:
10/11/2025 3:30:00 PM
Duration (total time in view):
60 minutes
County:
Boulder
Specific Location:
Gunbarrel and Niwot area
Number:
1
Age:
Immature
Sex:
Unknown
Plumage:
Transitional
Habitat
Gravel spit on SE side of Dodd Res.
Viewing Conditions
Optics:
Telescope 10x60
Distance:
50 yards
Light:
Overcast
Description of the Bird
The bird was a cormorant, which was significantly smaller than the Double-crested Cormorants that were nearby. It had a much smaller body and bill, but also showed a quite long tail: as least as long as those on the D-c Cormorants. It had a small white area at the back of the bill, which extended down a very small distance below the bill. It had a conspicuous green eye. The neck showed some brown feathers and was not totally black, which is why I think it was an immature bird that hadn't quite reached adult plumage.
Similar Species Discussion
The only real alternative in Colorado is Double-crested Cormorant, and it was significant smaller than that species in both body and bill size. Would be really small compared to a Great Cormorant, and showed features not consistent with the West Coast Cormorants.
Previous Experience
I see many hundreds of D-c Cormorants every year, and have seen many hundreds of Neotropic Cormorants in the tropics.
Date Documentation Submitted
10/12/2025 5:45:00 PM
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Location Map
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