Grey uab lag - cleverest tus neeg sawv cev ntawm lub ntiaj teb no ntawm cov noog

Tus uab lag gray ... Oh nws tsis tshua teb zoo, nws yog feem ntau blamed. Txawm yog hais tias nws yuav nco ntsoov cov lus zoo, cas nyob rau hauv dhau, mus ncaj qha mus rau lub excesses ntawm daim ntawv teev. Ib daim ntawv ntawm cov hotties yeej zoo kawg thiab.

Qhov no noog, piv txwv li, lub heev "kev hlub" ib tug neeg lwm tus zes thiab nyob rau hauv lawv me nyuam qaib. "Ua Tsaug rau lub" gray crows raids, tus xov tooj ntawm medium-qhov loj qhov me noog cov kwv tij tseg txo. Heev heev thaum sawv ntxov tawm tsam nyob rau hauv nroog thoob khib nyiab ntim nrog ntxiv wipers lag luam. Tsis txhob poob pom ntawm cov noog thiab balconies uas nroog cov neeg nyob tej zaum kuj tawm ib yam dab tsi siav. Thiab cov muaj peev xwm mus "lossis" lub tshiab lub tsho tiv no nrog yaj tsis piv tej lwm cov noog. Nightly "kev hais kwv txhiaj" tuav yuav luag them lub ntuj ib tug huab ntawm cov noog ua ntej tawm rau hauv lub hmo ntuj, mas nws yeej tsis rau lub paj hlwb.

Ornithologists ntawm lub xyoo pua xeem yuav tau ras los ntawm ib qho kev txom daim ntawv teev cov atrocities pojniam, vim hais tias ua ntej lub crows tswm deb ntawm lub zos, nyob rau hauv floodplains thiab feem ntau nyob rau hauv officers, es pua pua, raws li nws yog tam sim no. "Antisocial tricks" rau lawv ib feem pib xwb vim hais tias ntawm lub "conqueror" xwm - tus txiv neej uas tau los ua systematically rhuav tshem cov "phem" cov noog of prey, uas yog li ntawd, ntshai cov crows. Nyob rau hauv lub 50s ntawm lub xeem caug xyoo "free shooters" tau tsa txawm nyiaj ntsuab nyiaj tshwj xeeb thiab incentives rau tus tua ntawm cov noog of prey, allegedly kev rhuav tseg me me thiab pab tau kev ua si noog. Tsis tus xav li cas ntawm equilibrium tsim los ntawm qhov nws tus kheej?

Deprived ntawm tej yam ntuj tso cov yeeb ncuab, tus uab lag gray pib xav tias heev ntawm cov yooj yim thiab yog nws tus kheej lub koom haum, nuv ntses - noj lawv tus kheej thiab me nyuam qaib txhua hnub ruining dozens ntawm lwm leej lwm tus zes. Raven pejxeem loj hlob sai heev, nrog proportionate decreases sai "zaub mov".

Thiab cov uab lag, raws li cov piv txwv ntawm cov neeg pluag pre-revolutionary Russia, tsiv mus rau ib tug phem xyoo nyob rau hauv lub nroog, qhov twg kuv pom thiab "cov mis nyuj lub tsev txhab nyiaj" thiab "Kiselny dej." Shnyrov rau txoj hlua hnab, ces khi urbanite nyob rau hauv nws tus kheej lub qhov rais (tsis yog txhua tus yuav taus ib tug tub yees), insolent nyob rau hauv cov huab noog devastated "zaub mov pob tawb". Thiab nyob rau scraps ces muab pov tseg los ntawm lub qhov rais, uas tsis disdain tsis tau tsuas yog cov tsiaj qus cov dev thiab miv hauv qab daus, tiam sis tib tus uab lag, koj yuav tsis txawm kis. Nyob rau hauv Feem ntau, tus nqi ntawm cov hav zoov ib zaug loj hlob nahalok tam sim no lub zos yog incredibly ceev ceev.

Ib zaug ntxiv, "lub conqueror ntawm qhov" coj tuav ntawm rab phom, uas tau tsav los ntawm cov lus cog tseg ntawm cov tub ceev xwm kom tau rau tus uab lag tus taw daim ntawv tso cai (tshwj xeeb cov hoob kawm) los mus tua ib tug txawv kev ua si ...

Tab sis lub crows cawing tsuas yuam cai: "Nws tsis yog cov neeg me ntsis cov neeg tawm tsam! Peb tsis yog niam txiv dav, falcons, peb yog smarter! ". Thiab nws yeej muaj tseeb tiag. Ib tug amazing puas siab puas ntsws muaj peev xwm coj crows nyob rau hauv lub nroog, tus tib muaj peev xwm cia mus thiab volleys ntawm phom. Uab lag instantly pom tau hais tias ib tug neeg tau tsis tsuas mus rau noj, tab sis kuj yuav muaj cov muck.

muaj kev ruaj ntseg raws li ib tug neeg xav tau kev pab rau kev kawm los ntawm cov uab lag. Thov nco ntsoov: ib tug neeg sawv ua zoo dev tom tsis tus uab lag thiab tau taug kev mus txog thiab cia nyob rau hauv ib tug deb ntawm ib tug ob peb meters, tab sis yog tias biped mam li nco dheev txiav txim siab mus nrhiav rau nws, nws tam sim ntawd ya tawm meters los ntawm 10. Sim coj lub pob zeb tam sim ntawd kom qhov kev ncua deb meter ntawm 20. Ib tug phom nyob "lwv" uab lag tawm hauv lub xub ntiag.

Nws txo tus naj npawb ntawm crows yog tsis ib rab phom, tiam sis tus nqi sawv rau cov zaub mov thiab janitorial khaub rhuab. Tam sim no delicacies yog tsis muab pov tseg rau hauv xws li cov xov tooj, thiab txoj kev ntxuav huv si tsis tsuas rau hauv nruab nrab ntawm tus ciav, thiab tag nrho cov kev.

Uab lag - ib tug noog yog tsis yog ntse, tab sis kuj muaj peev xwm mus kawm, thiab kawm nws sai sai. Nws yuav tsum tau muaj ib tug mus twv hais tias soaked nyob rau hauv ib tug pas dej ua ke ntawm cracker tau yooj yim, kev txawj ntse instantly kis thoob plaws ib tug loj pab crows. Yog hais tias ib tug grey cheats tuaj nrog rau lub tswv yim khoov uncovered "tab" kaus poom los ntawm zaub mov kaus poom remnants, thiab tus so yuav pib los noj lub sij hawm zoo li.

Ntxiv mus, tus cwj pwm ntawm cov amazing noog ib txwm txaus prevailing teeb meem no. Rau miv, piv txwv li, lawv yog tsis muaj ab tsi li rau peck lawv nyuaj heev, tab sis cov neeg muaj mob thiab tsis muaj zog txaus kho siab me nyuam miv tam sim ntawd ua tus kwv uas saib xyuas ntawm lub uab lag.

Biologist Manteuffel recalled nyob rau hauv ib tsab xov xwm hais txog yuav ua li cas ib tug yaj ntawm sparrows, zoo siab ib ob peb ntawm ua luam dej pas dej ua ke nrog pelicans, txiav txim siab los coj ib tug poob rau hauv lub sov dej. Lawv plaub twb ntub thiab vim nws yog lub caij ntuj no, pib yuav tsum tau them nrog dej khov. Tsis muaj ab tsi ua ntej crows ua active kev nrhiav. Ib tug yaj ntawm sparrows tau overfished thiab tau noj ib tug peb lub hlis twg ntawm ib teev.

Cov tib sib koom tes thiab synergy tshwm sim thaum lub Uab Lag tag nrog hem lawv muaj zog predatory noog. Tsis txhob ib tug lub rooj sib tham nrog tus tseeb ib tug nyob rau ib qho, cov pob predator peck rau txoj kev tuag nyob rau hauv ib tug ob peb feeb.

Ntxiv mus, tus uab lag gray - ib tug lover ntawm kev lom zem thiab yuav tsis sawv laj. Thiab nws yog kev lom zem heev nyob rau hauv pab neeg no. Thiab kev lom zem lawv tau, ntawm chav kawm, pom zoo.

Ib tug ntawm cov menyuam kawm ntawv hais Biology Department, piv txwv li, ob crows, ua piv txwv uas lawv xav tau rau hauv lub aub lub tais, tos aub leaped rau lawv. Thaum lub sij hawm thaum tus dev nres twb unfolding, lwm Raven grabs tsis muaj hmoo tus tshwj ntxim dlej tuft ntawm cov plaub hau los ntawm cov rov qab. Lom ze txuas ntxiv kom txog thaum tus aub, tu siab thiab npau taws, tsis txhob muab tso rau nws nyob rau hauv lub rooj muag zaub.

Nyob rau lwm lub sij hawm lub grey tub sab rog tau ib tug aub pob txha crunched peacefully. Thaum ob tug ntawm lawv distracted cov xim ntawm peb sai sai rho tawm tus pob txha. Tej yam ua kom meej meej tsis nrhiav tej tswv yim lub hom phiaj vim hais tias cov pob txha ntawd ces muab pov tseg, thiab lub uab lag ya mus, es croaking.

Tam sim no, feem ntau ornithologists paub meej tias: uab lag txho, tsis emit tej kev zoo nkauj los yog loj, me, tsis muaj lub suab, tsis muaj sib npaug nyob rau hauv txoj kev ntse los yog cov noog los yog cov tsiaj. Nrog nws nyob rau hauv txoj kev ntse tau lwv tshwj tsis yog tias lub dolphins tab sis apes ...