. Territory in bird life . FFERENT SPECIES air and sometimes when it was settled on thetopmost branches of a dead tree, and the soundsproduced reminded one of the piping of a flockof Oyster-Catchers in flight. A battle between a pair of Green Wood-peckers and a Great Spotted Woodpecker mentioning. It occurred on the 24th ofApril. Passing through the middle of a wood,X-noticed a Great Spotted Woodpecj. ERRATUM For pair of Pied Woodpeckersread Great Spotted Woodpecker extended its wings fully and proceeded to peckviciously at its opponent. Whereupon therewas a scuffle at the mouth of th


. Territory in bird life . FFERENT SPECIES air and sometimes when it was settled on thetopmost branches of a dead tree, and the soundsproduced reminded one of the piping of a flockof Oyster-Catchers in flight. A battle between a pair of Green Wood-peckers and a Great Spotted Woodpecker mentioning. It occurred on the 24th ofApril. Passing through the middle of a wood,X-noticed a Great Spotted Woodpecj. ERRATUM For pair of Pied Woodpeckersread Great Spotted Woodpecker extended its wings fully and proceeded to peckviciously at its opponent. Whereupon therewas a scuffle at the mouth of the hole andthe Great Spotted Woodpecker hurriedly this, all was quiet and the Green Wood-pecker eventually descended and entered thehole. The Great Spotted Woodpecker, how-ever, returned again, but, after fluttering aroundthe hole, disappeared, leaving the Green Wood-peckers in possession. In this varied field of hostile behaviourwhich we have explored, one feature standsout prominently, namely, that the interest. ^SToru^a-UL- d^t. ^yU htjUzLe, {>€jMj-&en. cLpalrof yrcen/(j( a, f:i-cuor o^ SBi&dy fo-r^ ^chcj:iOMe<£iriy of a^ hxiie-iru cuiy lyoyk/ CONDITION ACCOMPANYING CHANGE 239 which a bird displays in other species variesnot only at different seasons but even fromhour to hour. I have used the word nature as equivalent to interest, and I have spokenof the birds nature changing or altering accord-ing to the circumstances in which it was its nature is its inborn constitution, and itsconstitution cannot change from day to day,still less from hour to hour. So that, in a sense,and having regard to strict scientific accuracy,it is misleading in this particular connotation tosay that the birds nature changes. What then does happen ? The instinct ofpugnacity must form just as much a part ofthe hereditary make-up of the migrant, whenon migration, as when finally it reaches itsdestination; still more must


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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, bookyear1920