Natural Selection and Tropical Nature: Essays on Descriptive and Theoretical Biology

abundant action adapted allied species America animals ants appear bamboo Batavia beautiful become bees beetles birds branches brilliant butterflies caterpillars causes chaffinches character civilised climate colour Colours of Animals concealment conspicuous curious Darwin distinct earth equatorial zone evidence exactly existence extinct facts families favourable feet female fertilised flowers foliage forests genera genus geological gravel green groups habits Heliconidæ humming-birds imitated important increase inhabit insects instinct islands kind larvæ laws less Malay Archipelago male mammalia mimicry mode modified moths natural selection naturalists nectary nest observed occur organic organisation origin Origin of Species ornaments Papilio peculiar phenomena pigeons plants Pliocene plumage probably produced protection race remarkable render resemble savage sexes sexual selection sometimes South South America spots structure sun-birds surface tail temperate theory tints tion trees tropical variation varied variety vegetation whole wings yellow