Stock Photo - The biologist Alex Jordan of the Max-Planck-Institute observes a Neolamprologus multifasciatus that has got a barcode attached to his head at the University of Constance, Germany, 12 December 2017. Scientists research the collective behaviour of fishes at the University of Constance. Photo: Felix Kästle/dpa. - Konstanz/Baden-Wuerttemberg/Germany

Stock Photo: The biologist Alex Jordan of the Max-Planck-Institute observes a Neolamprologus multifasciatus that has got a barcode attached to his head at the University of.

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