06 January 2014

Common Chickadee Trends - Kimberley Christmas Bird Count

Does this chart show Mountain Chickadees are increasing and Black-capped Chickadees are decreasing?

Or does it show observers in recent years have been more likely to identify chickadees to species level rather than just "unidentified chickadee" with a statistical bias to Mountains?

or some combination of the above ... Or something else?

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