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[Others 其他] Are Spring Migrants Less Common Now?

Do photographic records automatically get picked up and counted and if so was that always the case? For example, if someone posts a nice shot of Yellow-rumped flycatcher but does not submit a sighting record, is there a mechanism for adding this to the data? I confess I would not normally record my sightings of say Asian Brown Flycatcher although I guess I should. I do though occasionally take photos if it is a confiding bird. There may well be many images that don't get into the records but then there is the challenge of ensuring the bird is unique and not multiple-counted since many photographers don't disclose in detail where the image was taken. Its a fascinating subject. Our garden has had Black-winged cuckoo-shrike on 4 dates between Nov 30th and 19th December 2012 but I don't know that this is the same bird. I am assuming it is but I can't prove or disprove that. There must be lots of challenges to having data integrity.

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