Once the four Pandavas (except Yudhishthira who was not present) asked Krishna:

"What is Kaliyuga and what will happen during Kaliyuga?"

Krishna smiled and said "Let me demonstrate to you, the situation of Kaliyuga." He took a bow and four arrows and shot them in four directions and ordered the four Pandavas to go and bring them back.

Each of the four Pandavas went in the four different directions to search for the arrows. When Arjuna picked an arrow, he heard a very sweet voice. He turned around and saw a cuckoo singing in a spellbinding voice but was also eating flesh of a live rabbit which was in great pain

Arjuna was very surprised to see such a gory act by such a divine bird he left the place immediately.Bhima picked arrow from a place, where five wells were situated. The four wells were surrounding a single well.

The four wells were overflowing with very sweet water as if they were not able to hold water and surprisingly the well in the middle of these four overflowing wells was completely empty. Bhima was also puzzled at this sight.