Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 2

वानरः vanara, दुष्करम् formidable, निष्प्रतिद्वन्द्वम् which could not be challenged, चिकीर्षन् intending to (cross), समुदग्रशिरोग्रीवः raised his head and neck, गवां पतिः इव like the best of bulls, बभौ appeared.

Hanuman who raised his head and neck, intending to cross the formidable ocean which none else could accomplish, looked like a leading bull.