Hi Tom, Dave, and everyone --

The two scenarios posed by Dave are indeed good possibilities.

Another possibility is that these are second year (SY in banding lingo) 
birds that are on territory late for various reasons -- territory suddenly 
vacant due to death of the "owner", substandard territory being filled 
late by SY bird, etc. SY birds are usually the last to arrive and good 
habitat is frequently taken. It may then take them time to find a 
territory that is available. SY or subadult birds get whatever territory 
is left after the older birds have established theirs. Early June isn't 
too late to establish a territory and attempt a nesting. Although the 
migration this year seemed to be normal, these birds could also be late 
migrants just arriving and setting up territories or "hanging out" on the 
periphery of the territories of other birds with the chance of getting 
that territory if something happens to its owner. I do one of my Breeding 
Bird Surveys (BBS) on the Sunday of Memorial Day weekend (in Charles 
County) when possible and occasionally get late migrants, such as 
Blackpoll or Trail's Flycatcher so birds are still moving. This year, BTW, 
we had no migrants.

Just another thought ..................

Cheers,
Kathy

Kathy Klimkiewicz, Biologist
USGS Patuxent WRC BBL
12100 Beech Forest RD STE 4037
Laurel MD 20708-4037
301-497-5795 work
Fax 301-497-5717

Report bands: reportband.gov and get instant feedback!
http://www.pwrc.usgs.gov/bbl