This is Kaijay, one of the ambassador cheetahs. You can tell him a part from his sisters because he is bigger than them. Although, it is hard to tell him a part from Peter. Peter is bigger than Kaijay is, but Kaijay has a whiter tip on his tail. Otherwise, you can tell cheetahs a part by their behavior, their facial features (scars, marking, etc), their tails, or the darkness of their backs/ manes.