This is open for interpretation. For example, it's likely nobody here has seen every species of antelope, but it is possible someone has seen every species of oryx. You can get as technical as you want on this question using genus, common name, whatever.
As for me, I've seen both species of wolf, all three zebra species, both species of hippo, both species of bison, both species of wildebeest, and possibly all eight species of bears (some pictures in a photo album of a bear in the Cincinnati Zoo look like an Asiatic black bear, if anyone can confirm if they had those in the 80s).
Others where I'm close are elephants (haven't seen a forest elephant and probably never will), flamingos (haven't seen Andean or James), pelicans (haven't seen Dalmatian, spot-billed, or Australian), rhinos (haven't seen Javan or Sumatran and sadly probably won't see those), and swans (haven't seen whooper or coscoroba).
As for me, I've seen both species of wolf, all three zebra species, both species of hippo, both species of bison, both species of wildebeest, and possibly all eight species of bears (some pictures in a photo album of a bear in the Cincinnati Zoo look like an Asiatic black bear, if anyone can confirm if they had those in the 80s).
Others where I'm close are elephants (haven't seen a forest elephant and probably never will), flamingos (haven't seen Andean or James), pelicans (haven't seen Dalmatian, spot-billed, or Australian), rhinos (haven't seen Javan or Sumatran and sadly probably won't see those), and swans (haven't seen whooper or coscoroba).
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