The Audubon's Warbler appears to make less extensive use of the area.
Different fall and spring migration routes for the Audubon's Warbler remains a possibility and may help to explain the difference in age ratios observed between fall and spring (Gaddis unpubl, data).
Audubon's Warblers in spring typically appeared with freshly molted body plumage, with only 5.
As in the Audubon's Warblers, the peak in molt frequency occurred earlier than the peak in abundance (mid-April vs.
The low numbers of Audubon's Warblers undergoing prealternate molt and the early occurrence of the molt relative to their peak of abundance at SBL indicates that the prealternate molt occurred prior to arriving at SBL.