I read this story on Quora.
“What is Kaliyug and what will happen during Kaliyug?” asked the four Pandavas (except Yudhishthira who was not present).
Krishna smiled and said “Let me demonstrate you the situation during Kaliyug.” He took a bow and four arrows and shot them in four directions, and asked the four Pandavas to retrieve them.
Each of the four Pandavas went in four different directions to search for the arrows.
Arjuna, when picked the arrow heard a very sweet voice. He turned around and saw a cuckoo was singing bhajans in very 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 in disgust.
Bhima picked the arrow from a place where five wells were situated. Four wells were around a well in the middle. 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 puzzled at this sight.
Nakula was returning after picking up the arrow when he stopped at a place where a cow was about to give birth. After giving birth the cow started licking the calf but continued to lick it even after the calf was clean. With great difficulty people were able to separate them and by that time the calf was badly injured. Nakula was puzzled by the behaviour of such calm animal.
Sahdeva picked arrow which fell near a mountain and saw a big boulder rolling down. The boulder crushed rocks and giant trees on its way down. But the same boulder was stopped by a small plant. Sahdeva was amazed at this sight.
All the Pandavas asked the meaning of these incidents. Krishna explained with a smile.
“In Kaliyuga the priests will have very sweet voice and will also have great knowledge but they will exploit devotees the same way cuckoo was doing with rabbit. In Kaliyuga, poor will live among rich. The rich will have enormous amount of wealth which will actually overflow but they will not offer a single penny to the poor, just as the four wells didn’t share even a single drop of water with the empty well. In Kaliyuga parent will love their children so much that their love will actually spoil them and will destroy their lives similar to the love shown by cow to her newborn calf. In Kaliyuga people will fall in terms of character like the boulder from the mountain and they will not be stopped by anyone. At the end only the name of God will be able to hold them from doom like the little plant held the boulder from further fall.”