 | Charles Darwin - 2008 - 29 páginas
...rotundus' ('complete, polished, and round1). 7 'In North America the black bear was seen by [Samuel] Hearne swimming for hours with widely open mouth,...insects in the water. Even in so extreme a case as this, . . . , I can see no difficulty in a race of bears being rendered, by natural selection, more and more... | |
 | 1869 - 946 páginas
...in water, Mr. Darwin adds another consideration to account for the enormous head in Cetacea : — ' In North America the black bear was seen by Hearne...swimming for hours with widely open mouth, thus catching, almost like a whale, insects in the water.JI see no difficulty in a race of bears * Ib., p. 464. f... | |
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In North America the black bear was seen by Hearne swimming for hours with widely open mouth, thus catching, like a whale, insects in the water. 
