Tropical Nature, and Other EssaysMacmillan and Company, 1878 - 356 pages |
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Page 144
... female , not being urged on by such intense vital activity as in the case of the male , would be much slower , and , owing probably to inherited tendencies , in a different direction . The under - surface of the Chilian bird is ashy ...
... female , not being urged on by such intense vital activity as in the case of the male , would be much slower , and , owing probably to inherited tendencies , in a different direction . The under - surface of the Chilian bird is ashy ...
Page 145
... female shows also a slight diminution of size , but in other respects is almost exactly intermediate between the Chilian and Juan Fernandez females . The colour beneath is light ashy , the breast - spots are inter- mediate in size and ...
... female shows also a slight diminution of size , but in other respects is almost exactly intermediate between the Chilian and Juan Fernandez females . The colour beneath is light ashy , the breast - spots are inter- mediate in size and ...
Page 146
... female are necessary for colonization , yet , after a colony is formed , any stray bird which may come over adds to the numbers , and checks permanent variation by cross - breeding . We find , then , that all the chief peculiarities of ...
... female are necessary for colonization , yet , after a colony is formed , any stray bird which may come over adds to the numbers , and checks permanent variation by cross - breeding . We find , then , that all the chief peculiarities of ...
Page 158
... Females not a cause of Colour - Probable use of the Horns of Beetles - Cause of the greater brilliancy of some Female Insects - Theory of display of Ornaments by Males - Natural Selection as neutralizing Sexual Selection - Theory of ...
... Females not a cause of Colour - Probable use of the Horns of Beetles - Cause of the greater brilliancy of some Female Insects - Theory of display of Ornaments by Males - Natural Selection as neutralizing Sexual Selection - Theory of ...
Page 178
... female by far less brilliant tints or are altogether wanting ; as exemplified in the gold - crest warbler , the green woodpecker , and most of the orange- tip butterflies ( Anthocharis ) . Proceeding with our sur- vey , we find greater ...
... female by far less brilliant tints or are altogether wanting ; as exemplified in the gold - crest warbler , the green woodpecker , and most of the orange- tip butterflies ( Anthocharis ) . Proceeding with our sur- vey , we find greater ...
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Common terms and phrases
abundant adapted adorned Africa allied Amazon animals ants Asia attract bamboo Batavia beautiful become birds blue brilliant butterflies carnivora causes changes character characteristic climate colour Colours of Animals comparatively conspicuous continent curious Danaidæ Darwin distinct Eocene equator equatorial zone existence extensive fact families fauna favourable feet female ferns fertilization flowers foliage forests fruits genera genus greater green groups habits heat humming-birds hyænas immense inhabit insects Juan Fernandez land larger larvæ leaves lemurs less light Madagascar Malay Archipelago male mammalia marsupials Miocene monkeys natural selection naturalists North northern observed occur ocean ornaments Palearctic parrots peculiar perhaps phenomena plants plumage probably produced proportion protection rays region remarkable resemble sexual selection showy slender sometimes South America species spots structure sun-birds surface tail temperate zones temperature theory tints tion trees tropical trunks Ungulata variation varied variety vegetation whole wings yellow