Ben Osborne / Aerial view of African elephants (Loxodonta africana) find shade under trees to avoid midday sun, during a drought. Northern Botswana. Taken on location for BBC Planet Earth series, October 2005

Gerry Ellis / African Elephant (Loxodonta africana) herd of adults and calves running, Linyanti Swamp, Botswana

Gerry Ellis / Sunset and storm clouds over waterhole, Kwando River flood plain, Linyanti Swamp, Okavango Delta, Botswana

Richard Du Toit / African elephant sprays itself with mud {Loxodonta africana} Linyanti, Botswana, Southern Africa. The mud-pack, when dry, forms a hard crust that deters insect attacks.

Pete Oxford / Lions basking in sun {Panthera leo} Linyanti, Botswana

Christophe Courteau / African Buffalo (Syncerus caffer) calf running through a marsh in Marais de Linyanti River, Botswana, Africa

Kristel Richard / Herd of elephants (Loxodonta africana) drinking in the Linyanti River during the dry season, Chobe National Park, Botswana.

Kristel Richard / Herd of elephants (Loxodonta africana) drinking in the Linyanti River during the dry season, Chobe National Park, Botswana.

Kristel Richard / Herd of elephants (Loxodonta africana) drinking in the Linyanti River during the dry season, Chobe National Park, Botswana.

Ben Osborne / Aerial view of African elephant herd (Loxodonta africana) traveling through parched landscape during drought conditions, Northern Botswana. Taken on location for BBC Planet Earth series, October 2005

Ben Osborne / Aerial view of African elephant herd (Loxodonta africana) traveling through parched landscape during drought conditions, Northern Botswana. Taken on location for BBC Planet Earth series, October 2005

Ben Osborne / Aerial view of African elephants (Loxodonta african) bathing in mud on the banks of the Linyanti River, Botswana. Taken on location for BBC Planet Earth series, 2005