Valmiki Ramayana Kishkindha Kanda Sarga 40 Shloka 47

तत्र there, तत्कोपजम् born out of his anger, महत् great, हयमुखम् face of horse, तेजः bright, कृतम् is created, सचराचरम् both movable and immovable creatures, महावेगम् very fast, तत् that, अस्य its, ओदनम् food, आहुः they said.

'Here is born Hayamukha, out of the fastspreading fire of anger of the ocean. Its movable and immovable creatures constitute his food.