Mute swans are large swans, wholly white in plumage with an orange beak bordered with black. It is recognisable by its pronounced knob atop the beak, which is larger in males. The name `mute` derives from it being less vocal than other swan species. Great cormorants feeds on fish caught through diving on the sea, in estuaries, and on freshwater lakes and rivers . Northern birds migrate south and winter along any coast that is well-supplied with fish. Many fishermen see in the great cormorant a competitor for fish. Because of this, it was hunted nearly to extinction in the past.
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標準授權 | 480 x 320 px | JPG | 13 點 |
標準授權 | 800 x 533 px | JPG | 15 點 |
標準授權 | 2121 x 1414 px | JPG | 18 點 |
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標準授權 | 5184 x 3456 px | JPG | 23 點 |
標準授權 | Vector px | AI | 38 點 |
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進階授權 | 5184 x 3456 px | JPG | 88 點 |
進階授權 | 5184 x 3456 px | JPG | 88 點 |
進階授權 | 5184 x 3456 px | JPG | 88 點 |