I’ve been trying to years to get a good photo of a kangaroo hopping, from the side. Thus far, this is the best I can do. Straight ahead, you don’t have to track them and if you take several shots at once while adjusting focus, some of them turn out. When they’re moving side to side, they move so fast that by the time you get them in frame and focused, they’ve usually stopped hopping or the timing works out that it looks like they’re just standing on the ground.
In a zoo environment, you can’t really get a nice long shot from which to select particular animals. That’s how they do it in Australia which, alas, is not where I am.
My hope is that the upcoming Nikon d850 will be just enough faster that the shots I want will become a bit more feasible.