Valmiki Ramayana Sundara Kanda Sarga 64 Shloka 34
Original Shlokaततश्श्रुत्वा निनादं तं कपीनां कपिसत्तमः।।5.64.34।। आयताञ्चितलाङ्गूलस्सोऽभवद्धृष्टमानसः।
1 source checked for this shloka
ततः then, सः कपिसत्तमः that great monkey, Sugriva, कपीनाम् of the monkeys, तं निनादम् that roar, श्रुत्वा having heard, आयताञ्चितलाङ्गूलः lifting and shaking the long tail, हृष्टमानसः extremely happy, अभवत् remained.
The great Sugriva heard the roar of the monkeys and was extremely happy. He kept raising and shaking his long tail in joy.