The photo of two men standing on a mountain of bison skulls is well known as a symbol of hunting during colonisation of the US. But there's a more sinister story that lies behind it.

Historical photographs of bison extermination are a window into a history of relationships between humans, bison and the environment.

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Workers digging a pipeline in Argentina found the flattened skull of an ancient toddler, raising questions about its asymmetrical shape.

Men standing with pile of buffalo skulls, Michigan Carbon Works, Rougeville MI, 1892. (Burton Historical Collection, Detroit Public Library) We are living through a period of unprecedented species ...