Bird with 2 heads

A great bird lived on the banks of a lake.  He had two heads but a single body.  Both the heads had separate thinking.  Though they had a single body they thought of them as two most of the times.  
One day, the bird was wandering on the bank of the lake.  He found a very delicious fruit. One of his heads mumbled, 
“Oh what a fruit. I am sure the heavens have sent it for me. I am so lucky.” 
Hearing this, the second head, who was a little dumb of the two said, 
“O brother, let me also taste the fruit you are praising so much.”
The first head, who was the intellegent of the two, laughed and said, 
“Both of us have the same stomach. It makes no difference whether I eat it or you eat it. I shall give it to our beloved. She will be very happy.”  
Thus gave the fruit to his wife. The second head was disappointed at this action of the first head.
One day, the second head found a poisonous fruit and told the first head, 
“You treacherous fellow. For what you have done to me, I will eat this poisonous fruit and avenge your insult.” 
The second head said, “You fool, if you eat that, both of us will die because we have the same body.”

Ignoring his warning, the second head ate the poisonous fruit and both of them died.

Those who are not united will perish.