Iris color and speckling varies greatly in adult thayeri, even in the western part of the breeding range.
In the southern part of the breeding range in the Atlantic Ocean, Arctic Terns mingle with Common Terns.
Observational records of Black-headed Trogons have been reported from eBird well south of the breeding range.
The breeding range for C. n. niger is from Cuba east and south through the West Indies and Antilles.
Other migrant insects travel beyond the limits of their breeding range and either die or return to the breeding range.
Individuals begin appearing on breeding territories as early as March or April in the southern parts of the breeding range and as late as mid-June farther north.
The two species breed side by side in northern Alaska, actually Semipalmated Sandpipers are found in a large proportion of the breeding range of the Western.
My studies, heretofore unpublished, are suggestive of continuous phenotypic variation from darkest to lightest extremes in plumage of adults across the breeding range.
Throughout most of the breeding range, especially at high elevations and at more northerly latitudes, where breeders arrive relatively late in the spring (mid-April to May), only a single brood is raised.
Recent research by graduate students throughout the breeding range, including studies in Arkansas, Georgia, Illinois, Louisiana, Missouri, North Carolina, and South Carolina, has also revealed much about Swainson's Warbler.
Extensive human exploitation in the form of logging, mining, oil exploration, agriculture and prescribed burning continues to provide a constant supply of breeding habitat throughout much of the breeding range.
