| thumb | Hayagriva from the thangka of [[Tendrel Nyesel]] Hayagriva (Skt. Hayagrīva; Tib. རྟ་མགྲིན་, Tamdrin, Wyl. rta mgrin) — the wrathful manifestation of Avalokiteshvara who symbolizes enlightened speech, usually depicted as red in colour and with a horse's head protruding from his crown.
Hayagriva is one of the eight principal deities of Kagyé where he is referred to as Lotus-like Speech (པདྨ་གསུང་, pad+ma gsung). The instructions related to this form of Hayagriva are based on the so-called “three neighs of the horse”<ref>See Kongtrul (2005), p. 322</ref>.
In the Longchen Nyingtik, the Hayagriva practice related to Palchen Düpa is called “The Play of the Three Realms” (རྟ་མགྲིན་ཁམས་གསུམ་རོལ་པ་, rta mgrin khams gsum rol pa).
Sera Monastery has a Nyingma tradition of Hayagriva called Hayagriva Very Secret (Tamdrin Yang Sang) that is actively practised.
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