Magpies have been in the area since the end of the last ice age similar to the condors. So not necessarily all animals are representing an extinct animal rather the animals are representing what the area was like back then.Black billed magpie seems like an odd choice. Are they representative of an extinct species there? Are the elephant species rotated or is it a mixed exhibit? The concept of that exhibit is interesting, for as much hate as it gets. It just seems that there are some odd species choices in it. Are the pronghorn of the Peninsular variety? Didn't they used to also have bison in this exhibit?