Here's an image of three Red Kites from a trip to Gigrin Farm, a month or so ago. It shows three birds in a triangle. It's a complete fluke but lots of fun, nonetheless
ID Mark IV, EF 500. 1/2,000th sec, f/4, ISO 800, 500 mm. The light was horrible and I had to do a lot of work on the contrast to rescue this from the recycle bin.
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I've just published the first part of an in-depth tutorial on bird in flight photography on my website, if anyone is interested. I'd also be happy to receive feedback and your own tips and suggestions on how to improve it, to try to make it as useful as possible for all BIF photographers.