title: Comment on "Ducklings imprint on the relational concept of 'same or different'".
abstract: Martinho and Kacelnik (Reports, 15 July 2016, p. 286) reported that newly hatched ducklings imprinted on relational concepts. We argue that reanalyzing the data at the individual level shows that this conclusion cannot be applied for all sets of stimuli presented and that the ability to grasp relational concepts is limited to the stimulus category that is most beneficial for survival.
authors.affiliation: Institute of Behavioural Physiology, Leibniz Institute for Farm Animal Biology, D-18196 Dummerstorf, Germany. langbein@fbn-dummerstorf.de.
authors.forename: Jan
authors.identifier: 0000-0002-1170-5431
authors.initials: J
authors.lastname: Langbein
authors.affiliation: Institute of Behavioural Physiology, Leibniz Institute for Farm Animal Biology, D-18196 Dummerstorf, Germany.|Behavioural Sciences, Faculty of Agricultural and Environmental Sciences, University of Rostock, Germany.
authors.forename: Birger
authors.identifier: 0000-0002-5513-7907
authors.initials: B
authors.lastname: Puppe
mesh_terms: D000818:Animals; D004372:Ducks; D007173:Imprinting, Psychological