File:Image from page 303 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14804971413).jpg

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Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library


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Text Appearing Before Image: utnot particularly destructive here, has been accidentallytransported to France, and there it lias wrought greathavoc in the vineyards. Another instance, this time ofan aquatic animal, shows the same result : the periwinkle,Littorina littoria, now the commonest snail on the seashorenorth of New York, has migrated down the shore fromHalifax since 1868. This old species in the new countrylias almost driven out the other shore mollusks, to such anextraordinary degree has it multiplied. Now why shouldanimals in a new country develop with such unusual rapid-ity ? It is because coming into a new country they haveleft behind them their natural enemies, and there has notyet been time for them to acquire new ones. Eventually 284 ZOOLOGY the new enemies are gained or their old ones overtakethem, and then the numbers of the exotic form becomereduced ; a new equilibrium becomes established. The English sparrow belongs to the family Fringillidae,which includes sparrows and finches. This is a large

Text Appearing After Image: t Fid. l<)4. — The American crossbill (Loj-m family, comprising over five hundred species, found in allparts of the world, excepting, originally, Australia. Inthe United States this is the largest family of birds, com-prising in most places about one-seventh of the species.Among common or striking native Fringillidse may be THE ENGLISH SPARROW AND TTs ALLIES mentioned the crossbills,1 yellow-bird, vesper-sparrow,white-throated sparrow, tree-sparrow, chipping-sparrow,2snow-bird, song-sparrow, fox-sparrow, chewiiik, cardinalgrosbeak, rose-breasted grosbeak, and indigo-bird. Mostof these birds are known to every country boy. The family of Turdidae, r thrushes, includes severalcommon American birds, — the robin, abundant about


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Source Image from page 303 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900)
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