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I heard that bison is invariable in plural. can anybody confirm ?

It may or may not be invariable, depending on the writer. It was probably taken as invariable because it was a latin word, whose plural would be bisontes, and English-speaker have this thing for the foreign plurals. Circeus 19:18, 17 September 2008 (UTC)
IMO, bison is invariable in plural. I don’t ever recall seeing "some bisons" writing. —Stephen 13:34, 18 September 2008 (UTC)

RFV discussion: February–July 2015[edit]

See Talk:bysen#RFV discussion: February–July 2015.