Ever since the great sage Valmiki wrote the Ramayana,many poets got inspired and wrote many Ramayanas in different languages. In Sanskrit itself there are many Ramayanas apart from Valmiki Ramayana. One such Ramayana is Ananda Ramayana,also believed to be written by Sage Valmiki. But it differs from the original Valmiki Ramayana in having many strange and intersting tales which are not there in the Valmiki Ramayana. One such story is the birth of Hanuman.
According to the Ananda Ramayana, when King Dasharatha obtained the divine payasam (kheer) from Lord Agni on doing the Putrakameshti yaga for getting children,he divided the payasam into three equal portions and gave to his three queens, Kousalya,Sumitra and Kaikeyi. When they were about to drink their shares, a female hawk suddenly appeared, and snatching the bowl of payasam from Kaikeyi's hand,flew away! Thus Kaikeyi lost her payasam. Kousalya and Sumitra then gave half of their shares to her. Meanwhile, the hawk flew to Anjana mountain and threw the bowl there. Anjana, the wife of Monkey king Kesari drank that payasam and begot Anjaneya or Hanuman! This is how Hanuman was born. The hawk was actually an apsara called Suvarchala in her previous life. Once while dancing in Brahma's court,she missed a beat. Angered by this, Brahma cursed her to become a hawk. When she requested for forgiveness,he became compassionate and said when she threw Kaikeyi's payasam in Anjana mountain her curse would get redeemed. The hawk did accordingly and got redeemed of her curse, thereby becoming instrumental in the birth of Hanuman.