Sean Crane / Meerkat (Suricata suricatta) group on the lookout, Makgadikgadi Pan, Botswana

Sean Crane / Lechwe (Kobus leche) running through water, Okavango Delta, Botswana

Sean Crane / Honey Badger (Mellivora capensis) resting, Kalahari Game Reserve, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) bull marking territory by flicking dung, Chobe National Park, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) bull charging in territorial display, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) bull charging in territorial display, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) in territorial display, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius), Khwai River, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) spraying water from nostrils, Khwai River, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) flapping ears, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) bull, Khwai River, Botswana

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) bull, Khwai River, Botswana