In the Nat­ur­al His­tory Museum, where a fur­ther three groups of Oliv­er Mark’s pho­to­graph­ic works are shown jux­ta­posed with anim­al spe­ci­mens, the focus is on the pro­tec­tion of endangered spe­cies. In this way, vis­it­ors can explore a wide range of asso­ci­at­ive ideas.