n 2010, Frek (a Dutch chimp) has high pitched grunts compared to Lucy (an Edinburgh chimp). By 2013, the grunts of Frek and Lucy have become much more similar.
n 2010, Frek (a Dutch chimp) has high pitched grunts compared to Lucy (an Edinburgh chimp). By 2013, the grunts of Frek and Lucy have become much more similar.
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