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South Africa: Kwala Zulu Natal (1 Viewer)

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Riqui

Riqui
This gull is probably a greyheaded gull, but I would like to have your opinion about a blackheaded gull.
 

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You are right, it is a grey-headed gull, although this individual is quite similar to bhg. I think that black-headed tends to have less bulk/length in the tertials. Consequently they tend to show a more attenuated rear with more exposed primaries.
 
Coupled with what Morg says about the general "jizz", the bill would be finer and there would be no extension of grey onto the back of the neck/nape in Black-headed, the site rules out Hartlaub's so I'd go with Grey-headed.
Chris
 
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