Roman siege towers positioned to give attackers the advantage of height above the city walls, From Poliorceticon sive de machinis tormentis telis by Justus Lipsius (Antwerp, 1605), Engraving

A Cheetah ( Acinonyx jubatus ) takes advantage of a tourist vehicle to check for unsuspecting prey in the Masai Mara National Park

The spectacular cliff top village of Ireli and the carved 'Togu Na' or meeting house in Dogon Country. The many villages are mostly uninhabited now as the communities no longer need the defensive advantage provided by the cliffs.

Solitary bull African elephant Loxodonta africana takes advantage of the lull in activity around the waterhole to find a preferrable place to drink. Nyamandhlovu pan, Hwange National Park, Matabeleland north, Zimbabwe, Southern Africa

Local Zimbabwean's take advantage of a fast drift on the Zambezi river in the hope of landing a large tiger fish. Chewore fishing camp, Zambezi river, Chewore safari area, Zimbabwe.

Unidentified porcelain crab on Sea pen (Pteroeides sp.) Porcelain crabs are filter feeders and climb in the sea pen to take advantage of current. When the Sea pen retreats in the sand, the passenger goes with it. Rinca, Indonesia. (Digital capture).