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1、BuildingaBetterBirdhouseThere'snothinglikeafamilyofbirdsmovingintolivenupyouryard.Watchingthembuildandtendtheirnest,andthenwatchingtheyoungstersgrowisfascinatingsomethingeverykidshouldsee,too.Butjustbangingtogetheranyoldcondoinhopesofattractingsomebird
2、-buddiesrarelyworks.You'vegottoknowwhattheyneed.Here'saresidentialconstructionprojectyoucancompleteinafewhoursandenjoyforyears.It'sagreatopportunitytoworkwithyourkids,andyou'llprobablyfindallthelumberyouneedinyourpileofscraps.Nopowertools?Noproblem:bas
3、ichandtoolswilldojustfine.Bestofall,wegiveyouthecriticaldimensionsyouneedtobuildahousewherebirdswillfeelathome.DesignandConstructionBirds'sizeandhabitsdeterminethekindofhousetheywant.Unlikehumans,birdsaren'timpressedwithvastinteriorspace,anda"one-size-
4、fits-all"designwilllikelyremainempty.Abirdwantsahomejustlargeenoughtoholditsnest,withanentranceholejustbigenoughforitsbody.Anylarger,andabiggerbirdoranimalmighttakeoverthenestor,worse,eattheinhabitants.Birdsknowthisinstinctivelyandwillpassyourbirdhouse
5、byifitdoesn'tfitthem.Noworries,though:ourhandychartgivesallthedimensionsyouneedtobuildahouseproperlytailoredforeachofthecommonspecies.Ventilation,DrainageandSanitationThedesignshownallowsabout1/4inchbetweenthesidesandtheroofforventilation,anditsloose-f
6、ittingfloorprovidesdrainage.Whenthebirdsmoveoutattheendofthenestingseason,youjusttakeoutasinglescrew,andthebottomswingsdownforeasycleaning.Gettingridoftheoldnestisahealthfulpracticethathelpsattractnewtenantsinthespring.Withtheswingingbottom,thenestcome
7、soutintactperfectforyourkidstotaketoschoolforshowandtell.MaterialsPine,fir,cedar,redwoodandexteriorplywoodallworkwellforbirdhouses.Sincethepartsaresmall,leftoverlumberisoftenallyouneed.(Don'tusepressure-treatedwood,though:itcontainschemicalsthatcanbeha
8、rmfultobirds.)Youcanfinishtheoutsideorleaveittoweathernaturally.Stainisbetterthanpaint,sinceitwon'tpeelwithage.ButistheTibetanPlateaupoly.Centercityonlyapopulationofoveronemillion.Xiningislocatedinthe"Tangfangudao"andtheancient"SilkRoad
