Great sight of the Dark-bellied Brents flying past out to sea, they are such wonderful animals.
The second bird here MIGHT be a first year, just getting a white v-shaped collar, but still (maybe) with the whitish barring on the flanks.
Here is a link to an excellent video of a juvenile bird, taken in October 2011, before the white collar develops in mid winter. The white edges to the greater coverts seem very visible, and the generally browner tinges to the dark upper parts. https://www.youtube.com/watch?v=KhILLrcXo_w
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