第4节 (第1/2页)

    【】sh

    attrablebeesandthe

    birdsheseedsfarandiltheh

    hadbeeveredhgreenpastures,orlaydarkuhe

    shadoeofthefishestoo

    hadbeguhesea,andtheyhadleaedhoobreathe

    phibious,

    eansthattheyareabletolivehequaleaseontheland

    andihefirstfroghtellyou

    allaboutthepleasuresofthedoubleexistenphibian.

    osideofthealsgraduallyadapted

    theelvesreaolifeonland.sobecareptiles

    creaturesheysharedthe

    silenove

    fasterthroughthesoftsoil,theyirovedupontheirlegs

    andtheirsizeincreaseduntiltheedh

    gigantishehandbooksofbiologylistunder

    thenasofiegalosaurusandbrontosaurus

    obethirtytofortyfeetlongandouldhave

    playedhelephantsasafullgroplayshherkittens.

    sooftheersofthisreptilianfalybegantolivein

    thetopsofthetrees,orethanahundred

    feethigh.theynoloheirlegsforthepurpose

    oftovequicklyfrobr>

    branchtobrandsotheygedapartoftheirskin

    intoasortofparahedbethesidesof

    theirbodiesaoesoftheirforefeet,andgradually

    theyveredthisskinnyparachuteade

    theirtailsintoasteeringgearareetotreeand

    developedintotruebirds.

    thenastrahinghappened.allthegiganticreptiles

    diede.knohereason.perhaps

    itate.perhapsthey

    hadgronorwalknor

    craheystarvedtodeathhinsightbutnothin

    reachofthebigfesandtrees.everthecause,the

    llionyearoldpireofthebigreptileswasover.

    theobeoupiedbyverydifferent

    creatures.theyhedesdantsofthereptilesbutthey

    the

    ``aeorthebreastsofthether.ode

    sallstheseanils``als.theyhadshedthe

    scalesofthefish.theydidnotadoptthefeathersofthebird,

    buttheyveredtheirbodiesaalshowever

    developedotherhabitsheirraceagreatadvantage

    overtheotheranils.thefeleofthespecies

    carriedtheeggsoftheyounginsideherbodyuntiltheywere

    hatchedande,had

    lefttheirchildrenexposedtothedangersoflda,

    aalskepttheiryoung

    foralongtiaeredtheeywere

    stilltooies.inthisheyoung

    alsuetosurvive,because

    theyleaednythingsfroheirthers,asyouwillknow

    ifyouhaveeveratteagherkittenstotake

    selvesandhooheirfadhoo

    e.

    butofthesealsitellyouchforyou

    k