[i]Gazella spekei[/i]
OK, it's wonky, mesh- and foliage-obscured, and appallingly contrasty - but it's a photo of a Speke's Gazelle I took, so I don't care! (the wonkiness is due to having to hang over the edge of the boardwalk for a gap in the trees!)
According to the helpful lady running the giraffe feeding, these have been taken out of the giraffe paddock as the male gazelle had been attacking the giraffes!
Look at the full-size vesion of this shot and you can see the Speke's wrinkly nose. :)