I really valued the response by David Sibley on the hummingbird issue.
Thanks! I have another recommendation for those who want to read further on
the subject. Scott Weidensaul's "Living on the Wind" is an indepth book on
migration and incorporates a lot of research from numerous sources as well
as his own insights. It deals with some of these issues and the genetic
factors that influence them. Peggy Spiegel, Giles County
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