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Tree swallow unusual behavior



I observed, what appeared to be, two Tree swallows copulating on the wing
Saturday.  They "joined" at a very high altitude and fluttered and twirled
all the way down to tree top level.  I have observed this behavior with
White-throated swifts but this is a first for Tree swallows.  Anyone else
observed this behavior?  I couldn't find any reference to it in the
literature.

kestrel@valink.com
On the New River in SW VA