 | 1859 - 578 lehte
...hunger as winter comes on. This is strikingly proved by the case of particular species ; for we fiiid that their abundance in individuals bears no relation...abundant, while others producing two or three times as many young are much less plentiful ? The explanation is not difficult. The food most congenial to... | |
 | Sir Charles Lyell - 1868 - 692 lehte
...cats and weazels, or perish of cold and hunger as winter comes on.' * The most remarkable instances of an immense bird population is that of the passenger...abundant, while others producing two or three times as many young are much less plentiful ? The explanation is not difficult. The food most, congenial... | |
 | Alfred Russel Wallace - 1870 - 458 lehte
...broods are superfluous. On the average all above one become food for hawks and kites, wild cats or weasels, or perish of cold and hunger as winter comes...abundant, while others producing two or three times as many young are much less plentiful ? The explanation is not difficult. The food most congenial to... | |
 | Alfred Russel Wallace - 1871 - 412 lehte
...broods are superfluous. On the average all above one become food for hawks and kites, wild cats or weasels, or perish of cold and hunger as winter comes...abundant, while others producing two or three times as many young are much less plentiful? The explanation is not difficult. The food most congenial to... | |
 | Sir Charles Lyell - 1874 - 692 lehte
...food for hawks and kites, wild cats and weazels, or perish of cold and hunger as winter comes on.'* The most remarkable instance of an immense bird population...abundant, while others producing two or three times as many young are much less plentiful? The explanation is not difficult. The food most congenial to... | |
 | Alfred Russel Wallace - 1891 - 518 lehte
...number would really amount to more than two thousand millions ! food for hawks and kites, wild cats or weasels, or perish of cold and hunger as winter comes...abundant, while others producing two or three times as many young are much less plentiful ? The explanation is not difficult. The food most congenial to... | |
 | 1902 - 584 lehte
...number of individuals existing in any given country, twice that number must perish annually, — a striking result, but one which seems at least highly...abundant, while others producing two or three times as many young are much less plentiful? The explanation is not difficult. The food most congenial to... | |
 | C. Leon Harris - 1981 - 360 lehte
...result, but one which seems at least highly probable, and is perhaps under rather than over the truth. lt would therefore appear that, as far as the continuance...abundant, while others producing two or three times as many young are much less plentiful? The explanation is not difficult. The food most congenial to... | |
 | Charles Darwin, Frederick Burkhardt - 1985 - 726 lehte
...number of individuals existing in any given country, twice that number must perish annually, — a striking result, but one which seems at least highly...abundant, while others producing two or three times as many young are much less plentiful? The explanation is not difficult. The food most congenial to... | |
 | Charles Darwin - 1996 - 382 lehte
...whatever to their fertility in producing offspring. Perhaps the most remarkable instance of an immerse bird population is that of the passenger pigeon of...abundant, while others producing two or three times as many young are much less plentiful? The explanation is not difficult. The food most congenial to... | |
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It would therefore appear that, as far as the continuance of the species and the keeping up the average number of individuals are concerned, large broods are superfluous. On the average all above one become food for hawks and kites, wild cats and weasels,... 
