. How to attract and protect wild birds . he imitation of thepeculiarly-shaped woodpecker holes, as they were to be faithfullycopied, down to the smallest details. The accompanying illustrations,taken from photographs of the longitudinal sections of naturalwoodpecker holes, show clearly the method of their construction. The opening is always circular, and is of unvarying size with eachspecies, , with the lesser spotted woodpecker, IJ inch ; the greaterspotted woodpecker, If inch ; the green woodpecker, 2-| inches ; theblack woodpecker, 3f inches.* A very important point has been observed,
. How to attract and protect wild birds . he imitation of thepeculiarly-shaped woodpecker holes, as they were to be faithfullycopied, down to the smallest details. The accompanying illustrations,taken from photographs of the longitudinal sections of naturalwoodpecker holes, show clearly the method of their construction. The opening is always circular, and is of unvarying size with eachspecies, , with the lesser spotted woodpecker, IJ inch ; the greaterspotted woodpecker, If inch ; the green woodpecker, 2-| inches ; theblack woodpecker, 3f inches.* A very important point has been observed, namely, that by a wiseprovision of Nature the opening of all the holes is inclined upwardsto a certain angle (4 deg.) in the interior, so that the rain cannotpenetrate. * The measurements of the holes of the black woodpecker are correct when theopenings are round. When they are more or less oval, as is often the case,especially in eastern Europe, the horizontal diameter is nmaller, and the verticaldiameter is longer than is stated a, -73
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu319240, booksubjectbirds
