Verse 8

तत्रापश्यद्धनं श्यामं पीनं श्वपचपेटकम् ।गायन्मृदु वसन्तोत्थं कोकिलानामिव व्रजम्

In plain words

There he saw a dense, dark, plump throng of śvapacas, singing softly, like a flock of cuckoos risen with the spring.