I didn't know SD Zoo had 4 peninsular pronghorn. I checked ISIS and it does show SD having 4 males, which are most likely the first 2 sets of male twins born at the LA Zoo.
I'm more surprised at the fact that SD Zoo will maybe start updating ISIS.
At one point they were talking about letting the pronghorn mix in with the elephants (i.e., designing their part of the exhibit with an entry to the elephant exhibit where they could enter the larger exhibit if they wanted). Does anybody know why this idea got nixed?
Obviously it would be a geographical absurdity, but the general principle seems to be in practice at Dallas Zoo with their African elephants and antelope, but why specifically did San Diego decide it was a bad idea? Are pronghorns too flighty?
I don't know whether anyone but zoo management can properly answer that question. There are a multitude of factors that could come into play regarding a decision such as that. Honestly my best guess is that it would be more of a husbandry hassle than it was worth in this given situation. Dallas's exhibit is a completely different design.