Is this an Olrog's Gull? South Brazil (1 Viewer)

[tjbirder999]

I photographed this bird today as it flew along the beach near Lagoa de Peixe in Rio Grande do Sul, in the very south of Brazil. There had been a few Kelp gulls flying past, and I had been trying to keep an eye open for Olrog's, as it has been recorded here, though not often. Unfortunately, I saw this bird late. I noticed it had a dark head and took a photo as quickly as I could just after it had passed. I hope there is enough on the bird to identify it, but I cannot find many underwing shots to compare. What I have found seem to match, plus the dark tail band that can just be seen. However, I am not good on gulls, and I may well have missed something obvious. Any comments welcome.
thanks,

Tom

 

[BobbitWorm45]

The underwing looks good for Olrog's to me.

 

[tjbirder999]

The underwing looks good for Olrog's to me.

Thanks BobbitWorm45. It looks like it all fits for Olrog's. I was there again today, but no sign of it.

Tom