Cognition, nonhuman; Animal cognition ; Wissensdarstellung; Knowledge representation; Representation (mental) ; Natural kind terms; Mental representation ; Belief/false belief (cognitive science) ; Überzeugung (Kognitionsforschung) ; Propositional attitude ; Simulation theory; Theory theory; Other minds ; Spracherwerb und neurologische Entwicklung; Language acquisition and neurological development; Sprache und Denken (Ontogenese) ; Language and thought (ontogenesis) ; Cognitive development; Language acquisition and cognitive development