It is not the yawn picture i wanted (it did yawned twice throughout the photo session), but close enough.Read all about it here:www.eol.org/pages/326801
Die Sugthiere in Abbildungen nach der Natur /.Erlangen :Expedition des Schreber'schen sugthier- und des Esper'schen Schmetterlingswerkes [etc.,1774]-1846..biodiversitylibrary.org/page/31078212