World’s rarest whale may have washed up on New Zealand beach, possibly shedding clues on species ABC News‘World’s rarest whale’ washes up on New Zealand beach Fox Weather World’s Rarest Whale Washes Up On New Zealand Beach Barron’sOnly 6 of these rare mammals have ever been seen; now, scientists think they have a 7th OregonLiveNew Zealand: ‘World’s rarest whale’ washes ashore DW (English)