After a walk in the field i reviewed my photos and found a strange image, i saw that in a sequence of 2 photos that i shot a bird, with an interval of seconds between them, a risk appeared below the bird. i used my photo editing program to see if it was dirt on the lens and i came across this strange object, entering or leaving a dark spot just behind, or in front of, it. i have the files in raw if you like to check (sorry for the text, but i don't write in english and i used the google translator)

Images

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