Roland Seitre / African Elephant (Loxodonta africana) adult and baby, wet with rain, playing in red dust. Tsavo National Park, Kenya, 2009.

Roland Seitre / African Elephant (Loxodonta africana) juvenile and baby, wet with rain, playing in red dust. Tsavo National Park, Kenya, 2009.

Roland Seitre / African Elephant (Loxodonta africana) juvenile and baby, wet with rain, playing in red dust. Tsavo National Park, Kenya, 2009.

Roland Seitre / African Elephant (Loxodonta africana) juvenile and baby , wet with rain, playing in red dust. Tsavo National Park, Kenya, 2009.

Konrad Wothe / Chimpanzee (Pan troglodytes) male on patrol, Mahale Mountains National Park, Tanzania, East Africa

Konrad Wothe / Young Chimpanzee (Pan troglodytes) hanging off branch, Mahale Mountains National Park, Tanzania, East Africa

Peter Blackwell / African elephant calves playing {Loxodonta africana} Lake Jipe, Kenya

Angela Scott / Marsh African Lion {Panthera leo} cubs playing on females, Masai Mara NR, Kenya

Richard Du Toit / Portrait of a Hippopotamus {Hippopotamus amphibius} yawning as part of threat display, Moremi Wildlife Reserve, Botswana

Andrew Parkinson / Hippo male scattering dung to express dominance, Moremi Game Reserve (Hippopotamus amphibius) Botswana.

Richard Du Toit / Two subadult Cheetah cubs {Acinonyx jubatus} Savute-Chobe NP, Botswana

Peter Blackwell / Topi calves play fighting, Masai Mara, Kenya