In addition, the barnacle goose ("B. leucopsis") was determined to be a derivative of the cackling goose lineage, whereas the Hawaiian goose ("B. sandvicensis") originated from ancestral Canada geese. Thus, the species' distinctness is well evidenced. A recent proposed revision by Harold C. Hanson suggests splitting Canada and cackling goose into six species and 200 subspecies. The radical nature of this proposal has provoked surprise in some quarters; Richard Banks of the AOU urges caution before any of Hanson's proposals are accepted.