Imam al-Dhahabi mentions the following story in his entry for Sufyan al-Thawri -Allah have mercy on him- (as cited in Fawaid al-Gharra 3/281):
“Ali bin Abd al-Aziz said: Arim narrated to us saying: I went to Abu Mansur to visit him, he said to me: Sufyan resided in this house, and there was here a nightingale belonging to my son.
He [Sufyan] said: Why is this locked up (in a cage)? It should be freed
I said: It belongs to my son, and he gives it to you as a gift
Sufyan said: No, I will give him a dinar for it
He said: He then took it and freed it, and it would go out and return in the evening, and would be at the far end of the house.
When Sufyan died, it followed his funeral procession and was flying over his grave. After this on some nights it would go to his grave, and sometimes would spend the night there, and sometimes would return back home.
They then found it dead by his grave and it was buried alongside Sufyan.