Valmiki Ramayana Ayodhya Kanda Sarga 66 Shloka 10
Original Shlokaनदतां भीमघोषाणां निशासु मृगपक्षिणाम्। निशम्य नूनं सन्त्रस्ता राघवं संश्रयिष्यति।।2.66.10।।
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निशाम् at night, भीमघोषाणाम् ghastly sounds, मृगपक्षिणाम् of animals and birds, नदताम् by those making sounds, निशम्य having heard, सन्त्रस्ता frightened, नूनम् surely, राघवम् Rama, संश्रयिष्यति will take shelter.
Hearing the ghastly sounds of animals and birds, Sita will surely get frightened and take shelter in Rama.