Originally on en.wikipedia.org, uploaded by user Mdf at 19:10, May 3, 2006. Original caption follows.

Chipping Sparrow -- Bluffer's Park, Toronto, Canada -- 2006 May

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Four calls, all more or less the same. In the background is: American Robin, Mourning Dove (wing-whistles only: it flys off at about 13 seconds into the recording), Red-winged Blackbird, Canada Goose, and Common Grackle.