Hi Dion, Mick, I often see leucistic Providence Petrels up here and it
shouldn't be confused with belly plumage wear commonly seen later in the season
(August-October) in worn adult birds. We photographed one on the recent sea
mounts trip which had a broad crescent of pure white feathers in the breast and
in addition to the normal whitish face feathering had frosty white feathering
going up further over the head. The most extreme example I've seen was a bird
in 1998 (can't relocate photos taken at the time) which had the general plumage
configuration of a Tahiti Petrel, which no way could be attributed to plumage
wear. As Dion points out Providence Petrels are almost identical in structure
to Grey-faced Petrels, not at all like Kermadec and even less like Herald. A
lot of Kermadecs (but not all) can also show a whitish leading edge to the
inner wing but Herald shows an extensive pale 'flash' down through the
secondaries. Cheers - Paul.
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