Ian and others,

You aroused my curiosity, so I did some browsing. It appears that Olive-sided
Flycatchers, like most neotropical migrants, raise one brood per year. Western
Birds' Nests, by Harrison, Peterson Series, suggests that they may, however,
make up to three nesting attempts if they experience failures. Anyway, here
are a few links; also, Birds of North America, No. 502, covers this species.

Audubon Watchlist: audubon2.org/webapp/watchlist/viewSpecies.jsp?id=152

Cornell:
http://birds.cornell.edu/programs/AllAboutBirds/BirdGuide/Olive-sided_Flycatcher_dtl.html

All Taxa Biodiversity Inventory at Smokey Mtn Park:
http://www.dlia.org/atbi/species/animals/vertebrates/birds/tyrannidae/olive_sided_flycatcher.html

Lisa Godina
LMGodina at reachone.com