Here's Cassius coming down to land on a customer at one of the new locations for our walks, Riverside Camp site. If you look half way along each wing, you'll see one feather sticking up. This configuration breaks up the flow of air over that part of the wing and helps make it more stable at low speed. Ideal for landing. It's the same idea as the " fingertips" at the end of his wings.
Thanks to Marco Oliveira for the photograph and the kind remarks on Trip Advisor,
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