How close is too close?

On the drive back to Gaborone we saw 2 elephants and a giraffe on the side of the road. Rob gets so excited when he sees animals and wants to take so many photos. When we saw the first elephant he had me hanging out the window taking
photos while he drove, getting progressively closer. I guess we got too close because the elephant started shaking its giant head and mading terrible noises. I was so afraid that it would charge the car! Luckily we were able to drive away. We have now established boundaries regarding how close Robert can get to wild animals!

Rob taking photos of Rhinos