Agalu ali, mwina, osamvetsetseka kwambiri kuchokera ku lingaliro la sayansi la zinyama. Chowonadi ndi chakuti kwa zaka mazana angapo chiyambi chawo ndi nkhani yotsutsana za sayansi. Musati muyankhe kuti galu ndi chosowa chamtundu wa chigawo cha placental. Icho chiri cha dongosolo la okonzeratu, banja la agalu, banja la agalu ndi kuwona kwa agalu oweta.
Kodi malingaliro a chiyambi cha agalu ndi ati?
Pakadali pano, mbiri ya chiyambi cha agalu imayandikana kwambiri ndi mimbulu, mimbulu, agalu a ku dingo a ku Australiya ndi ma coyotes. Choncho, asayansi akufotokozera chiyambi cha galu panyumba ndi mfundo ziwiri. Malingana ndi oyamba, iwo ndi mbadwa ya mmbulu (izi ndizinso za Charles Darwin), ndipo omvera a chiphunzitsochi chachiwiri akuwona agalu monga chifukwa cha kulumpha mimbulu, mimbulu ndi nkhandwe. Posachedwapa, nthano yachitatu, yomwe Karl Linnaeus adayankhula, adapezanso ufulu wamoyo. Maphunziro atsopano atsopano amatsimikizira mosapita m'mbali kuti mimbulu ndi mimbulu zakale zinali ndi kholo lofanana, lomwe linatha.
Ndizomveka kudziwika kuti mu Bronze Age mtundu wa agalu oweta anaphatikizapo mitundu isanu:
- Masitiffs;
- ziboliboli (greyhounds);
- agalu-ngati agalu;
- agalu abusa;
- agalu wonga pointer.
Pofufuza za chiyambi cha mafuko a agalu, ofufuza adafika pozindikira kuti anawonekera chifukwa cha kubwezeretsa nyama ndi kubzala nyamazi. Masiku ano, mitundu yambiri ya agalu imagawidwa m'magulu atatu: kusaka, ntchito, mkati ndi kukongoletsa. Zosiyanasiyana ndi umboni wa zofuna ndi zovuta kusankha, zomwe zimagwirizana kwambiri ndi momwe makolo athu akale anamenyera kuti athe kukhalapo.
Zirizonse zomwe zinali, galu, umboni wa kukhalapo kwa zaka 25-30 miliyoni, wakhala ndipo wakhalabe bwenzi lodalirika ndi wothandizira anthu.