Ubusuku buya ngokuya buba bude, umoya ugcwele ukuqabuleka nesithwathwa, izitshalo zimbozwe isithwathwa sokuqala, futhi izinyoni zilungiselela uhambo olude. Yebo, ikwindla selifikile futhi nalo sekuyisikhathi sokuya osebeni olufudumele.
Hhayi kithi, kodwa kubafowethu abanezimpaphe. Badla kakhulu futhi ngenkuthalo baqongelela amafutha, okuzobasindisa emoyeni obandayo futhi kugcwalise umzimba ngamandla. Ngesinye isikhathi esihle, umholi womhlambi uyakhuphuka futhi athathe indlela eya eningizimu, futhi emva kwakhe zonke ezinye izinyoni zigijimela eningizimu.
Ezinye izinyoni zihamba zodwa, ngoba umuzwa wazo wemvelo uyazi ukuthi ungandiza kuphi. Yiqiniso, akuzona zonke izinyoni ezivame ukundiza zibheke eningizimu. Ngakho-ke, izinyoni ezihlala phansi njengondlunkulu, onogwaja, izingwe namagwababa zizwa kahle emakhazeni ebusika.
Bangandizela emadolobheni badle ukudla okuhlinzekwa ngabantu, futhi lezi zinhlobo zezinyoni azisoze zandizela emazweni ashisayo. Kodwa-ke, iningi lezinyoni livame ukundiza.
Izimbangela zokufuduka kwezinyoni ebusika
Wake wazibuza kungani izinyoni zindizela eningizimu zibuye emuva? Ngemuva kwakho konke, bangahlala endaweni eyodwa bangenzi izindiza ezinde nezikhathaza. Kunemibono eminingi ngalokhu. Enye yazo kungenxa yokuthi ubusika sebufikile - usho futhi uzobe ulungile ngokwengxenye.
Kuyabanda ebusika futhi kufanele bashintshe isimo sezulu. Kodwa amakhaza ngokwawo akusona isizathu esenza izinyoni zishiye amazwe azo. Izimpaphe zivikela ngokwanele izinyoni eqhweni. Cishe uzomangala, kepha i-canary iyakwazi ukusinda ezingeni lokushisa lama -40, uma-ke, akunazinkinga ngokudla.
Esinye isizathu sokundiza kwezinyoni ukuntuleka kokudla ebusika. Amandla atholakalayo ekudleni asetshenziswa ngokushesha okukhulu, kulokhu kulandela ukuthi izinyoni zidinga ukudla njalo futhi ngobuningi bazo. Futhi njengoba ebusika kungagcini ngokuba nezitshalo ezibandayo, kepha futhi nomhlaba, izinambuzane nazo ziyanyamalala, ngakho-ke kuba nzima ngezinyoni ukuthola ukudla.
Ubufakazi bokuthi kungani izinyoni eziningi zindiza zibheke eningizimu ngenxa yokushoda kokudla ukuthi lapho kunokudla okwanele ukudlula ebusika, ezinye izinyoni ezifudukayo zihlala ezweni lakubo ngesikhathi samakhaza asebusika.
Kodwa-ke, kunjalo le mpendulo ayinakuba ngeyokugcina. Ukucabanga okulandelayo nakho kuyimpikiswano. Izinyoni zinomqondo okuthiwa wemvelo wokushintsha indawo ezihlala kuyo. Abanye ososayensi basikisela ukuthi nguyena obenza bathathe uhambo olude noluyingozi, bese bebuya emuva ezinyangeni ezimbalwa kamuva.
Vele, indlela eziphatha ngayo izinyoni ayiqondakali ngokuphelele futhi izifihla yona uqobo izimfihlakalo eziningi, izimpendulo ososayensi abangakazitholi. Kunomunye umbono othakazelisayo kungani izinyoni zindiza zibheke eningizimu ekwindla bese ubuya. Isifiso sokubuyela ekhaya sihambisana nezinguquko emzimbeni ngesikhathi sokukhwelana.
Izindlala ziqala ukukhipha ama-hormone ngenkuthalo lapho kwenzeka ukukhula kwesizini kwama-gonads, okwenza izinyoni zithathe uhambo olude ziye ekhaya. Ukucabanga kokugcina kokuthi kungani izinyoni zivame ukubuyela ekhaya kususelwa eqinisweni lokuthi ezinyonini eziningi kulula kakhulu ukukhulisa inzalo ebangeni eliphakathi kunaseningizimu eshisayo. Njengoba izinyoni ezifudukayo zisebenza ngokwemvelo ngezikhathi zasemini, usuku olude luveza amathuba amaningi okuthi zondle izingane zazo.
Izimfihlakalo zokufuduka kwezinyoni
Izizathu zokuthi kungani izinyoni zindizela eningizimu azifundiswanga ngokugcwele, futhi akunakwenzeka ukuthi kube khona usosayensi ongafakazela ukungaqondakali kwalokhu noma leyomfundiso yokufuduka ebusika. Zigwebele ngokwakho ubuwula bezindiza zezinhlobo ezithile zezinyoni.
Isibonelo, inkonjane ikhetha ubusika ezwenikazi lase-Afrika, lapho ilanga lifudumala ebusika. Kungani inkonjane kufanele inqamule iYurophu ne-Afrika lapho kunezindawo ezifudumele ezisondele kakhulu? Uma uthatha inyoni efana ne-petrel, khona-ke indiza isuka e-Antarctica iye eNyakatho Pole, lapho kungakhulunywa khona ngokufudumala.
Izinyoni zaseTropical ebusika azisongelwa amakhaza noma ukuntuleka kokudla, kepha lapho sezikhulise inzalo yazo, zindiza ziye emazweni akude. Ngakho-ke, umashiqela ompunga (angadidaniswa nokuncipha kwethu) undizela e-Amazon minyaka yonke, futhi lapho kufika isikhathi somshado, ubuyela e-East India.
Kuyamukelwa ngokujwayelekile ukuthi lapho kufika ikwindla, izimo azihlali kahle ezinyonini zaseningizimu. Isibonelo, endaweni eshisayo, nasenkabazwe, kuvame ukuduma kwezulu, nalezo ezingatholakali emazweni anesimo sezulu esipholile.
Izinyoni ezindizela ezindaweni ezinesimo sezulu esishisayo zishiya izindawo ezinenkathi eyomile ehlobo. Ngakho-ke, ngesikhova esineqhwa, indawo efanelekile yokwakha izidleke ise-tundra. Amahlobo apholile nokudla okwanele njengamakhemikhali enza i-tundra indawo yokuhlala ekahle.
Ebusika, uhla lwezikhova ezineqhwa lushintsha ku-steppe yehlathi lendawo ephakathi. Njengoba kungenzeka ukuthi ubusuvele uqagele, isikhova ngeke sikwazi ukuba khona ema-steppes ashisayo ehlobo, ngakho-ke ehlobo siphinde sibuyele ku-tundra futhi.
