Yiziphi kulezi zinyoka ezinobuthi ezilandelayo ezizalela amaqanda: i-copperhead, i-water moccasin, inyoka enamaqhubu, inyoka yamakhorali.
Inyoka yamakhorali iwukuphela kwenyoka enobuthi ebalwe ohlwini eyingqamuzana elizalela amaqanda, noma elizala amaqanda. Ama-copperhead, ama-water moccasin nezinyoka ezinamaqhubu ziyi-ovoviviparous, futhi zizala izinsana eziphilayo.