What was the appearance of the hawks?

From the text.... descriptions;

In real life, goshawks resemble sparrowhawks the way leopards resemble housecats. Bigger, yes. But bulkier, bloodier, deadlier, scarier and much, much harder to see. Birds of deep woodland, not gardens, they’re the birdwatchers’ dark grail.

Goshawks in the air are a complicated grey colour. Not slate grey, nor pigeon grey. But a kind of raincloud grey, and despite their distance, I could see the big powder-puff of white undertail feathers, fanned out, with the thick, blunt tail behind it, and that superb bend and curve of the secondaries of a soaring goshawk that makes them utterly unlike sparrowhawks.

Goshawk: nineteen to twenty-four inches.

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