On the third day of our recent trip down to Norfolk (13th) we spent the day around Cley and Holkham, where the highlight was being able to get some good views of the Black Brant (our first), as well as plenty of Dark-bellied Brent Geese and a couple of hybrids. Here's a post with plenty of photos which will hopefully allow a good comparison...
Black Brant at Cley with Dark-bellied Brent Geese - video best viewed in HD at 1080p. Note the chocolate-brown tone to the upperparts.
Black Brant x Dark-bellied Brent Geese hybrids at Holkham - with slightly duller flanks than pure Brants as well as slightly smaller collars and a greyish wash to the upperparts. For more on hybrids check out this Birding Frontiers post.
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