Differences in size, shape and colour of the heads and bills of three tern species found on Sable Island, October 29th. From left to right, Sandwich (winter adult), Royal (first winter), and Caspian (winter adult).
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Differences in size, shape and colour of the heads and bills of three tern species found on Sable Island, October 29th. From left to right, Sandwich (winter adult), Royal (first winter), and Caspian (winter adult). |
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