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. 2018 Jul 10;5:152. doi: 10.3389/fvets.2018.00152

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Copyright © 2018 Hurley and Oakes.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Mean preference for the top half of each face type by age and pet status. The individual blue circles represent a single infant; the squares represent the mean of each group.