Valmiki Ramayana Yuddha Kanda Sarga 41 Shloka 95

महावीर्यः of great prowess, गिरिकूटोपमः resembling mountain, हरिः Monkey, सुषेणस्तु Sushena also, तत्र there, कामरूपिभिः who change their form according to their will, बहुभिः many, वानरैः Vanaras, सम्वृतः surrounded.

Sushena of great prowess, who resembled a mountain in form stood there surrounded by many Vanaras who could change their form at their will.