You did not ask me before and, therefore, I did not tell you, Hear as I tell you who that mungoose was and why he could assume a human voice.
वैशम्पायन उवाच एतत् पूर्वं न पृष्टोऽहं न चास्माभिः प्रभाषितम्। श्रूयतां नकुलो योऽसौ यथा वाक् तस्य मानुषी॥