His mum, Bella, died after giving birth and over the past four weeks, a dedicated team of keepers at Bristol Zoo have fed him day and night to keep him alive.

And now the little monkey, named Pichiku, is thriving.

The zoo is believed to be only the second in the country to have succeeded in hand-rearing a titi monkey to this stage.

They are found in remote forest areas of Brazil and Peru where they feed on fruit, leaves, insects and seeds.

Keepers began by carrying him home in an incubator for the first two-and-a-half weeks, feeding him one milligram of formula baby milk every two hours.

Pichiku means little monkey in a local Peruvian dialect, one of the native countries to red titi monkeys. He is now being fed every three hours and is taking up to 5mg of milk.

The baby monkey is still only about 12cm long but is sleeping through the night from his final feed at 12.30am until his morning feed at 6.30am.

He is starting to eat baby rice and learning to lap at it for the first time.

Pichiku is being kept in a small enclosure away from the public, where the temperature is maintained between 22C and 25C.

He lies on a soft golden teddy bear which it is thought he thinks of as his mum.

Keeper Emily Lewis said: "He has survived against all the odds. He's definitely a fighter, a determined little one."

Pichiku has started to climb and develop muscles in his arms. It will be two years before he is fully grown.

The next step will be re-introducing him to his father, Junin, who lives in the enclosure next door.

Red titi monkey fathers usually look after their babies after the first two days before returning them to their mother for feeding.

Pichiku's father carried him around after his mother died but would not have been able to keep him alive.

Ms Lewis said: "We are hoping that dad will recognise him and they will get on when we put them together. But we won't know how they will react until we try it.

"For now, they have visual access to each other all day where they can see, hear and smell each other to ensure they are as familiar as possible. They are often heard vocalising away to each other, with lovely high-pitched chirps."