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View Diary: The Daily Bucket: gulls at sunset (65 comments)

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  •  The size difference between the two is very (9+ / 0-)

    large.  According to Sibley a Caspian weighs about 5 times as much as a Common Tern (has a 50 inch wingspan compared to 30 inches for common).

    Caspian Tern is the size of a gull (in fact slightly larger than a Ring-billed Gull).

    Other characteristics to look for (breeding coloration) - Common has a rounded back of the head and an orange/red beak with a black tip.  Caspian has an all red beak and the back of the head has an angle to it (like a Royal Tern).

    "To see both sides of a quarrel, is to judge without hate or alarm" - Richard Thompson

    by matching mole on Sun Jun 16, 2013 at 01:29:14 PM PDT

    [ Parent ]

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