I found this piece of information, is this true?:
Hello, you've read conflicting info on this because you have been reading material written by people who Don't Know Canaries, and who treat them as 'just another finch'. True, canaries are a member of the finch family, but if you want to know how social they REALLY are or are not, look up Carduelan Finch; that's the finch family canaries belong to. To help you out a little, I will point out that my website at A Place For Canaries covers this subject in exhaustive detail, and so do my books; if you have read ANYTHING I've written then you probably know my answer already. But for the record, NONE of the carduelan finches are social; instead, like canaries, and unlike most other finch species, they are territorial. This means that another bird in the cage is NOT considered to be a pal, but is either an intruder or (for part of the year only, and only if both birds are in top notch physical condition) a potential mate. Neither attitude promotes peace, and in fact the most usual result of making two canaries share a single cage throughout the entire year, no matter how large the cage is or what their genders, is the eventual death (and it will be a slow,lingering one) of the less dominant of the two.
This death can take a year or two to occur, and all the owner usually knows is that one of their two canaries 'died suddenly without warning' (that the owner could see).
Answer (1 of 2): Hello, you've read conflicting info on this because you have been reading material written by people who Don't Know Canaries, and who treat them as 'just another finch'. True, canaries are a member of the finch family, but if you want to know how social they REALLY are or are n...
www.quora.com