Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 191

घनराजीव like a mass of heavy clouds, गर्जन्ती roaring, वानरम् that vanara, समभिद्रवत् ran towards him, ततः then, मेधावी intelligent, महाकपिः Hanuman, तस्याः her, विवृतम् opened, कायमात्रम् body alone, सुमहत् enormous, मुखम् mouth, मर्माणि च vatal parts, सः he, ददर्श saw.

Roaring like a heavy mass of clouds, Simhika chased Hanuman. Intelligent Hanuman observed her enormous mouth and noticed her vital parts.