Saturday, December 19, 2015

Guano Walls




http://ngm.nationalgeographic.com/visions-of-earth/visions-earth-2011?source=fophotosc1

Stone walls on Isla Guañape Norte in Peru prevent precious bird droppings, called guano, from falling into the Pacific. Coveted as fertilizer, the dung must be reaped by hand. Here a worker returns sifted-out feathers and bones.

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