koi.webp is adapted from these photographs by Martin Kammerer (cut out, straightened and packed
into one atlas) and is shared under CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/).
Source photos, CC BY-SA 4.0, via Wikimedia Commons:
  https://commons.wikimedia.org/wiki/File:Ginrin_Ochiba_Shigure_nishikigoi_Konishi_Koi_Farm_Martin_Kammerer_ID7397-.jpg
  https://commons.wikimedia.org/wiki/File:Karashigoi_nishikigoi_Konishi_Koi_Farm_Martin_Kammerer_ID2799-.jpg
  https://commons.wikimedia.org/wiki/File:Kohaku_nishikigoi_Konishi_Koi_Farm_Martin_Kammerer_ID7185-.jpg
  https://commons.wikimedia.org/wiki/File:Kujaku_nishikigoi_Konishi_Koi_Farm_Martin_Kammerer_ID3251-.jpg