Jeju Wildlife Research Center
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kang
22-11-14 Á¶È¸¼ö: 519

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Leslie
22-11-16
I think maybe this is an immature Rook. The bill looks different because perhaps it is growing it in. The bill is quite sharp, and Carrion Crows have a thicker and duller bill. Also the leg feathers are rougher and less neat, which is more common with Rooks.
I'll try to translate this into Korean too...

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More info here:
http://www.thegrangecl.co.uk/newsite/page/Steves_Blog/page1/?post_id=54&title=crow-or-rook-can-you-tell-the-difference

https://www.bto.org/our-science/projects/gbw/about/background/projects/garden-rook-survey/identifying-rooks

From the website... "A juvenile Rook, however, is similar to a Carrion Crow as it doesn't develop the bare bill-base until its second calendar year. If you're not sure, look for the Rook's characteristic flat forehead, peaked crown, ruffled drooping belly feathers and feathered thighs.

Rooks also have a straighter, more pointed bill, unlike the Carrion Crow's thicker, blunter and more curved bill."
  
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