Date: 11/26/19 7:08 pm
From: <t4c1x...>
Subject: [obol] rock sandpiper questions

Can someone with experience with both races of Rock Sandpiper and with Purple Sandpiper tell me if the difference in bill length between both Purple Sandpiper and Pribilof Rock Sandpiper and Aleutian Rock Sandpiper is as great as Sibley's illustrations suggest. Is there overlap in culmen length between the Aleutian Rock and the other two? And is the difference in bill length a useful characteristic in field identification?


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