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The tendency of fish to perceive the Ebbinghaus illusion was investigated. Redtail splitfins (Xenotoca eiseni, family Goodeidae… Expand Adults, infants and non-human primates are thought to possess similar non-verbal numerical systems, but there is considerable… Expand While disoriented humans and animals use both landmarks and environmental geometry to guide their navigation, it is not clear… Expand The ability of fish to perceive subjective (or illusory) contours, ie contours that lack a physical counterpart in terms of… Expand In 2008, inland waterways in Catalonia (northeast Iberian Peninsula, Spain) experienced one of the worst droughts recorded in… Expand It has been shown that children and non-human animals seem to integrate geometric and featural information to different extents… Expand Summary 1. The impact of habitat disturbance on biodiversity conservation and animal health is poorly understood. Selective… Expand We evaluate the hardness of foods consumed by sympatric Cercopithecus ascanius (redtail guenons) and Lophocebus albigena (grey… Expand From January 1998 to December 2002, we collected 293 fecal samples from free-ranging individuals of the 4 guenon species of… Expand Adult male redtail guenons (Cercopithecus ascanius) live as resident males in heterosexual groups or as nonresident males outside… Expand