Hazrat Saeed bin Al-Musayyib says that a goat is obligatory for this.

Hazrat Ata says that whoever kills a pigeon from among the pigeons of Makkah, a goat becomes obligatory upon him.

Hazrat Ata says that in this case, a goat is obligatory.

Hazrat Salamah bin Muhariz says that I closed my door in Makkah, and when I opened it again, two birds had died. I asked Hazrat Tawus about this. He said: Slaughter two goats.

Hazrat Ibn Abbas (may Allah be pleased with them) said: For every bird (pigeon) of the Haram, it is obligatory to give one goat in compensation.

Hazrat Ata says: For the dabsi bird (which is red and black in color), the pigeon with a beautiful voice, and the al-akhḍar bird (which is considered unlucky among the Arabs), a goat is obligatory in exchange.

Hazrat Hakam narrates from a Sheikh of Makkah that there was a pigeon sitting at home which fell onto the hand of Hazrat Umar. Hazrat Umar gestured with his hand, so it flew and sat on a house in Makkah where a snake ate it. Hazrat Umar made a goat obligatory upon himself.

Hazrat Salih’s father narrates that I performed Hajj with Hazrat Uthman. I prepared a bed for him in a house, and he lay down. Meanwhile, a pigeon came and sat on the skylight above the bed and began to scratch with its feet. I was afraid that it would drop dirt or something else onto the bed, which would wake Hazrat Uthman, so I shooed the pigeon away. It then sat on another skylight, from which a snake emerged and killed it. When Hazrat Uthman woke up from his sleep, I told him about this incident. He said,“Offer a goat as compensation on your behalf.”I said,“I only drove it away because of you.”He replied,“Then offer a goat on my behalf as well.”

Hazrat Ata says that the first person to pay compensation for the birds of the Haram was Hazrat Uthman.

Hazrat Saeed bin Al-Musayyib says that if the pigeons of the Haram are killed in Makkah, then it is obligatory to give a goat in compensation.