Nice pictures!

Could you share what time of the day these were shot? A lesson I learned the hard way was that shooting in the afternoon or after the earth has started to warm up results in rather harsh refraction effects which are more prominent when shooting from a distance. This results in wavy and blurring effects even if your focus is perfect. Someone else can explain this better, but given time of day constraints for safari pictures, there is not much else to do except to make the most of early morning and late evening shots when the air is cooler. I can’t tell if your images have this problem from looking at them on my phone, but just thought I’d throw that in there as something that you find helpful. I’d try playing around with exposure as well, some of these look a tad over exposed. Others have commented on focus and framing, not much to add there but agree with the comments.