Capt. Clark, March 6, 1806--The Cormorant is a large black duck which feeds on fish; I proceive no difference between it & these found in the rivers of the Atlantic Coasts. we met with it as high up the river as the enterance of the Chopunnish into the Kooskooske (ed. - Clearwater) river. they increased in numbers as we decended and formed much the Greatest portion of waterfowls which we saw on the Columbia until we reached tidewater, where they also abound but do not bear a similar proportion to the fowls found in this quarter. we found this bird fat and tolerably flavoured as we decended the Columbia.