https://www.nationalgeographic.com/animals/article/101215-head-bobbing-lemur-new-species-exotic-animal-pictures
Pictures: New Head-Bobbing Lemur Found in Madagascar? | National Geographic
Meet the new rock star of Madagascar: an odd lemur species with head-bobbing theatrics, a high-pitched call, big feet, and a long tongue.
head bobbingpicturesnewlemurfound
https://erowid.org/experiences/exp.php?ID=55005
Hydromorphone (Dilaudid) - Erowid Exp - 'The Bobbing Head'
An Experience with Hydromorphone (Dilaudid). 'The Bobbing Head' by Yurt
hydromorphonedilaudiderowidexpbobbing