Tern Quiz

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Posted by Richard Millington (212.229.29.244) on August 06, 2000 at 09:25:18:

Hi
I guess the oriole is a Hooded...

The tern is surely a juvenile Common, albeit a very pale one. The carpal bar is hidden, but the bill and leg colour are good for Common. More convincing for me are the head pattern and primaries: The white forehead runs way back past the level of the eye as streaking into the central crown, leaving the black lores relatively isolated (arctic has more of a 'hooded' pattern and more restricted pale forehead). In Arctic, the closed primaries (ie. the outer webs) often look darker than the wing coverts, but tend to be concolorous (the grey bloom matching the coverts, as in the photo)on Common.

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: Hi : I guess the oriole is a Hooded... : The tern is surely a juvenile Common, albeit a very pale one. The carpal bar is hidden, but the bill and leg colour are good for Common. More convincing for me are the head pattern and primaries: The white forehead runs way back past the level of the eye as streaking into the central crown, leaving the black lores relatively isolated (arctic has more of a 'hooded' pattern and more restricted pale forehead). In Arctic, the closed primaries (ie. the outer webs) often look darker than the wing coverts, but tend to be concolorous (the grey bloom matching the coverts, as in the photo)on Common.

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