I think if we were to get a second sheep it wouldn't be another Northern American one though. If we did get another caprine from the continent it'd probably be the musk ox.Not necessarily. We typically have at least 2 of everything in the game, some cases have 3...
So, just because we have the Dall sheep doesn't mean we won't get a 2nd sheep; in fact, I bet that if we were to get a 2nd, hotter climate species (like the mouflon or bighorn sheep), then the Dall sheep would only be better since that's our cold climate equivalent