Right across from the bonobos, this paddock used to hold the mountain bongos, and then common waterbuck. Now it holds these three guys and a pair of West African crowned cranes. They were a bit jumpy, springing up and staring when they heard some music abruptly come on, but they calmed down and kept eating.
Well it's not going to be Puku as, to my knowledge, there are none in the US. Kob are a possibility but unlikely as they're not a program species. My money's on a lechwe, and I agree with @d1am0ndback that they appear to be Nile.