河克爾頓是一種出現於新生代第三紀的大形水生物,被認為是鯨魚的祖先。骨骼海狗海豹一類的鰭腳動物;身體則細長,類似鯨魚。據專家指出,其骨骼最長可達22.5公尺,牙齒像海豹,臉上長有鼻孔。加拿大奧古布古有可能就是河克爾頓的殘存。

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