According to the image's author here, citing "an email from a field biologist", the bird is "a juvenile Red-tailed Hawk dining on a California Meadow Vole Microtus californicus".
This image, originally posted to Flickr, was reviewed on 22 October 2018 by the administrator or reviewerRonhjones, who confirmed that it was available on Flickr under the stated license on that date.
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