The critters below are red hartebeest. They are very elusive and wary. There was a small heard of zebra tagging along with this bunch. The zebra like to hang out with other animals like the hartebeest which makes it that much harder to get close.
This is the impala from the pic my son took. Along with a second impala they stopped about 150 yards out from us to look back at whatever had scared them. But by then it was to late for them. I had already jumped out of the truck and was on the sticks and zeroed in on them. I dropped him with one shot from my 264 Win mag.