Imam Malik's Muwatta, Chapter: Hajj

Yahya related to me from Malik from Yahya ibn Said that Said ibn al-Musayyab used to say, "For the pigeon of Makka, when it is killed, a sheep is due." Malik said, that if a man of the people of Makka were to enter ihram for hajj or umra and there was a flock of Makkan pigeons in his house and they were shut in and died, "I think that he should pay for that with a sheep for each bird."