Vagrant Gull at Guilderton WA

I was at the Birds Australia WA monthly meeting last night, and Alma de 
Rebeira reported a vagrant gull at Guilderton at the mouth of the Moore 
River about 1.5 hours north of Perth.

She said it was between the size of a Silver Gull and a Pacific Gull, with 
a black tail band.  She mentioned other plumage features (generally grey I 
think was one of them?), but I can't remember them.  She said she was 
going to write it up (Atlas URRF?  or maybe for WA Bird Notes).

She wasn't sure which species.  Possibly Black-tailed Gull?

She saw it the weekend before last, but it was not there last weekend.  So 
keep a look out if you are in or near Perth.
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