Mary Allen
Nangumi wakupha ndiye mtundu waukulu kwambiri wa dolphin padziko lapansi ndipo, monga ma dolphin onse, ndi mtundu wa cetacean. Amatchedwanso orca kapena killer whale. Nangumiyo anapatsa namgumi wakuphayo dzina lakuti “nyangumi wakupha” chifukwa amaoneka mwankhanza pamene namgumi wakuphayo akuthamangitsa nyama yake.
Anangumi opha anthu amatalika mpaka mamita khumi ndipo nthawi zambiri amalemera matani angapo. Toni ndi 1000 kilograms, mofanana ndi kulemera kwa galimoto yaing'ono. Amatha kukhala ndi moyo mpaka zaka 90. Zipsepse zakumaso za anangumi opha zimatha kukhala pafupifupi mamita awiri kutalika, zimawoneka ngati lupanga, komanso zimawapatsa dzina lawo. Chifukwa cha mitundu yakuda ndi yoyera, anamgumi akupha ndi osavuta kuwawona. Ali ndi nsana wakuda, mimba yoyera, ndi banga loyera kumbuyo kwa diso lililonse.
Mbalame zakupha zimagawidwa padziko lonse lapansi, koma ambiri amakhala m'madzi ozizira ku North Pacific, ndi North Atlantic, ndi nyanja za polar ku Arctic ndi Antarctic. Ku Ulaya, anamgumi opha anthu amapezeka kwambiri ku gombe la Norway, ndipo ena mwa anamgumiwa amapezekanso ku Baltic Sea ndi kum'mwera kwa North Sea.
Kodi ma killer whale amakhala bwanji?
Anangumi akupha nthawi zambiri amayenda m’magulu, akuyenda pa liwiro la makilomita 10 mpaka 20 pa ola limodzi. Ndiko kufulumira ngati njinga yapang'onopang'ono. Amathera nthawi yawo yambiri pafupi ndi magombe.
Nangumi wakupha amathera theka la tsiku kufunafuna chakudya. Monga killer whale, imadyetsa makamaka nsomba, nyama zam'madzi monga seal, kapena mbalame za m'nyanja monga ma penguin. M’magulu, namgumi wakupha nawonso amasaka anamgumi ena, omwe makamaka ndi ma dolphin, mwachitsanzo, anamgumi ang’onoang’ono. Anangumi opha anthu saukira anthu.
Palibe zambiri zomwe zimadziwika za kubalana. Ng'ombe za Killer whale zimakhwima pakugonana pafupifupi zaka zisanu ndi chimodzi mpaka khumi. Mimba imatha chaka chimodzi mpaka chaka chimodzi ndi theka. Pobadwa, mwana wa ng’ombe wa chinsomba amakhala ndi utali wa mamita awiri ndipo amalemera makilogalamu 200. Imayamwa mkaka kuchokera kwa mayi ake kwa chaka chimodzi kapena ziwiri. Komabe, ikudya kale chakudya cholimba panthawiyi.
Kuchokera pa kubadwa kumodzi kupita kwina kungatenge zaka ziwiri kapena khumi ndi zinayi. Ng'ombe ya killer whale imatha kubereka ana asanu kapena asanu ndi limodzi pa moyo wake. Komabe, pafupifupi theka la iwo amafa asanabereke okha.