title: Commentary: Experimental evidence for compositional syntax in bird calls.
authors.affiliation: Mathematical Neuroinformatics Group, Human Informatics Research Institute, National Institute of Advanced Industrial Science and Technology Tsukuba, Japan.
authors.forename: Steven
authors.initials: S
authors.lastname: Phillips
authors.affiliation: School of Computer Science and Engineering, University of New South Wales Sydney, NSW, Australia.
authors.forename: William H
authors.initials: WH
authors.lastname: Wilson
keywords: category theory; compositionality; syntax; systematicity; universality