Barred Wobbler
Well-known member
It was the lack of much in the way of description of Ruppells in both text and bird field guides that motivated Javi Elorriaga and Guillermo Rodrigez in Dutch Birding (Vol 38, Issue 6, 2016). If you can get your hands on the paper it's a mine of information on ID features.
Its title is 'Identification of Ruppell's Vulture and White-backed Vulture and Vagrancy in the WP'. It includes many photos of various plumages as the birds age and also plenty of text to describe the differences. The paper runs to over 20 pages, so there's a host of information.
https://www.dutchbirding.nl/journal/38/6 That link is to the Dutch version, but it's also available in English.
Highly recommended.
Its title is 'Identification of Ruppell's Vulture and White-backed Vulture and Vagrancy in the WP'. It includes many photos of various plumages as the birds age and also plenty of text to describe the differences. The paper runs to over 20 pages, so there's a host of information.
https://www.dutchbirding.nl/journal/38/6 That link is to the Dutch version, but it's also available in English.
Highly recommended.
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