This is another story of Hanuman's birth:

Anjana was an apsara, a celestial dancer, but cursed to be born on earth as a monkey, a shape-shifting monkey able to change her form.

One day Anjana put on a human form and walked across a mountaintop where Vayu, the wind-god, saw her and was captivated by her beauty.

"I am Vayu," he said to her, "and I love you! You will bear my son, and he will be able to move as the wind does, flying as high as he wants."

So Anjana conceived Hanuman, the monkey-son of Vayu the wind-god.

Others tell a different story about Hanuman:

Dasharatha took the celestial kheer and gave it to his three wives: Kaushalya, Kaikeyi, and Sumitra.

Kaushalya ate and conceived Rama. As she ate, a crow snatched some kheer, flew away, and dropped the kheer into the mouth of the apsara Anjana; she conceived Hanuman.

Kaikeyi ate and conceived Bharata. As she ate, a crow snatched some kheer, flew away and dropped the kheer into the mouth of the rakshasi Kaikasi; she conceived Vibhishana.

No crows bothered Sumitra when she ate the kheer and conceived her two sons, first Lakshmana and then Shatrughna.

Hanuman's mother was Anjana, but when he was born, she left him alone in the forest.

Baby Hanuman grew hungry. Very very hungry.

So when he saw what he thought was a mango in the sky, he wanted to eat that mango. He flew into the sky, eagerly reaching with his hands to grab the mango, ready to bite it with his teeth.

But it wasn't a mango. It was the sun!

Indra the storm-god grew angry and hurled a thunderbolt at Hanuman. Hanuman fell to the ground and broke his jaw.

That's how he got the name Hanuman, Big-Jaw.

Vayu picked up Hanuman and rocked the baby in his lap. Indra's attack on Hanuman made Vayu very angry, so he stopped the air from moving. Nobody in the three worlds was able to breathe!

Brahma then came and healed Hanuman, whereupon Vayu let the air move again so that everyone could breathe.

Next, all of the gods bestowed blessings on Hanuman. Indra gave him protection against thunderbolts, Surya gave him radiance, Yama freed him from all sickness, and Vishvakarma made him invulnerable to weapons.

Thus Hanuman was destined for greatness.

Sugriva would need his help.

And so would Rama.

Having received boons from the devas, Hanuman grew up to be a strong and fearless monkey. He was also mischievous! He liked to tease the rishis of the forest, breaking their pots, tearing up their clothes, and interfering with their sacrifices.

Finally the rishis cursed Hanuman. "You will forget all your powers!" they shouted at him, and Hanuman no longer remembered the divine boons he had received.

It was not until he heard the words of King Jambavan years later, on the shore of the ocean, that he remembered the supernatural abilities he would need to carry out Rama's orders.

As he grew, Hanuman sought wisdom. He learned all he could from books and wanted to learn more.

He asked Surya, the sun-god, to be his guru, but Surya refused. "I must travel all day," Surya said. "I don't have time to stop for lessons."

"I will run backwards, never stopping, so that I may learn from you," said Hanuman.

Thus Surya became Hanuman's guru, and Hanuman's face was burned black from looking directly at the sun.

Having completed his studies, Hanuman wanted to give Surya the guru-gift.

"Look after my monkey son, Sugriva," said Surya.

So Hanuman befriended Sugriva.

As Vali was older than Sugriva, he was king of Kishkindha.

The bull-asura Dundhubi came to Kishkindha and challenged Vali. "I wanted to fight Ocean," Dundhubi said, "but Ocean said Mountain was stronger. I wanted to fight Mountain, but Mountain said you were stronger. I want to fight you, Vali!"

But Dundhubi didn't know that Vali had an amulet given to him by his father, Indra, that deprived Vali's opponents of half their strength. The stronger the opponent, the stronger Vali became.

Vali grabbed Dundhubi's horns, easily smashed him to the ground, and threw his mangled corpse into the air.

When Vali threw Dundhubi's corpse into the air, it flew over the ashram of the rishi Matanga on Rishyamukha Hill.

Drops of Dundhubi's blood rained down upon the ashram, and this made Matanga angry. When he saw Dundhubi's corpse lying on the ground, he shouted out a curse. "Whoever threw this corpse will die if he ever sets foot on Rishyamukha Hill. His head will explode in a thousand pieces!"

So when Sugriva later had to flee from Vali, he hid on Rishyamukha Hill.

Why did Sugriva have to flee his brother Vali?

It was because of Dundhubi's son, Mayavi.

After Vali defeated the buffalo-asura Dundhubi, Dundhubi's son, Mayavi, decided to avenge his father. "I will kill you, Vali!" Mayavi roared as he came crashing through the forest.

Vali and Mayavi fought one another there in the forest, and then Mayavi fled into a cave.

Before following Mayavi into the cave, Vali commanded his brother Sugriva to keep watch. "If I fail and Mayavi emerges from the cave, you must kill him."

Sugriva waited.

And waited.

No one emerged from the cave.

Thinking Vali was dead, Sugriva sealed up the cave and declared himself king.

But Vali was not dead.

Deep inside the cave, Vali fought with Mayavi until he killed the asura and then fell into a deep sleep.

When Vali awoke, he made his way to the cave entrance, only to discover a huge boulder blocking his path. "Sugriva!" he shouted. "What have you done?"

Roaring with anger, Vali smashed the boulder and rushed to the palace, where he found Sugriva on the throne.

Vali tried to kill Sugriva, and Sugriva fled to the only place of safety he could think of: Matanga's ashram on Rishyamukha Hill where Vali dared not go.

Hanuman joined Sugriva in his exile.