Common Loon

Gavia immer
Common Loon specimens on display in the exhibit "Birds of D.C."

DC Information

Common transient and wintering species found on bays, estuaries, ponds, and reservoirs. Arrives in early September, leaves by late May. Winter plumage is brown above, summer plumage is speckled black and white above. Sexes are similar.

Specimen Information

The bird on the left is in winter plumage, while the bird on the right is in breeding plumage.  Although one is a male and the other a female in the exhibit, there is no sexual dimorphism - males and females look the same regardless of season. 
The bird in winter plumage is a juvenile female.
Date: 4/28/1883
Collected By: Frank R Towns
Locality:  Washington, DC
Sex: Female juvenile
Catalog ID: 91628
On the right is an adult male in breeding plumage.
Date: 6/14/1888
Collected By: Vinal U Edwards
Locality:  Woods Hole, MA
Sex: Male
Catalog ID: 113617