FUNDING
This work was supported by the Cornell Lab of Ornithology Athena Grant,
the Andrew W. Mellon Student Research Grant, the American Ornithological
Society Research Award, and the Cornell University EEB Paul P. Feeny
Graduate Student Research Fund (all to N.R.H.) N.R.H. was also supported
by the following fellowships: Charles Walcott Graduate Fellowship,
Treman-Williams Graduate Fellowship, Edsall Ornithology Graduate
Fellowship, and the Ivy Fellowship.