otter (lutrinae) eating crab on ice / danwon-gu, ansan-si, gyeonggi-do, south korea - excretory system 個影片檔及 b 捲影像00:06
3d medical animation - movement of urine from kidney through renal tubules to urinary bladder - excretory system 個影片檔及 b 捲影像00:35
old world swallowtail (papilio machaon) excreting waste / ilsan-gu, goyang-si, gyeonggi-do, south korea - excretory system 個影片檔及 b 捲影像00:18
osprey excreting on the top of a tree branch, kasanka national park, zambia, africa - excretory system 個影片檔及 b 捲影像00:03