LIBROS DEL AUTOR: h breucker

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  • Seasonal Spermatogenesis in the Mute Swan (Cygnus olor)
    H. Breucker
    Of all the classes in the animal kingdom, birds represent the best known. There are in total about 8600 living species, and the systematic study of this class is more or less complete. Extensive observations - to a large extent by amateur ornithologists - with respect to geographical distribution, life cycles, demands on and adaptations to the environ...
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