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The younger the baby the more difficult it is to hand-rear successfully.
I am hoping to handle the babies and maybe hand-rear them if they need it.
But a team of keepers intervened to hand-rear Sid to save her.
'I’d been looking for a parent-reared male bird because I don’t have time to hand-rear one myself,’ he says.
Zoo officials quickly decided to hand-rear the little offspring after Cheyenne neglected previous cubs she gave birth to.
There, three zookeepers will hand-rear him, providing 24-hour foster care to the tiny cub until he reaches a year old.
Despite this, zoos did have limited success and at least one zoo was able to hand-rear a white-necked rockfowl.
Knut was rejected by his mother, but Berlin Zoo decided to hand-rear him, in a controversial move.
She said the zoo did not like to hand-rear animals unless absolutely necessary, but added: "Arnie did the job wonderfully for us.
"We'll have to hand-rear them, Stina," said Zach.
Once volunteering, Rachel jumped at the opportunity to hand-rear Nkan, a two-week-old orphaned gorilla.
BBC News - Farmers hand-rear calf in kitchen
As we would really prefer to have chicks that were parent-reared we had decided that we must grit our teeth and not hand-rear this year.
If you are going to breed birds, at some point you will find yourself in the position of needing to be able to hand-rear a chick or chicks.
Breeders tend to remove the young kits from the mother to hand-rear, as owners prefer tamer and more handleable foxes, thereby making them more expensive.
The polar bear cub Knut was rejected by its mother last year, but Berlin Zoo decided to hand-rear it - a move which proved enormously popular.
If Tian Tian does have twins, she will reject one of them and keepers will have to hand-rear the cub.
Rob Harvey breeds small numbers of African Greys throughout the year and he has two dedicated members of staff who hand-rear his birds in very small numbers.
But a lamb that you hand-rear, that you personalise, that you give it a name and then announce that is going off to the abattoir is wrong.
Was it right to hand-rear such an animal or should nature be allowed to take its course, which in this instance would have almost certainly meant witnessing the spectacle of ursine cannibalism?
However, cannibalism of one of the litter by the mother, and the subsequent death of the mother, meant that Aharoni had to hand-rear the pups during the journey back.
According Roebke, who helped hand-rear Knut in the Berlin Zoo, Knut is a "publicity-addicted psycho" who needs the show, the human adulation.
But she was the runt of the litter and staff have had to hand-rear her after being rejected by her mother and was at risk of being killed by her seven brothers and sisters.
I believe that Nuremberg Zoo's decision to hand-rear the cub will just produce another psychopath," pointing to Berlin Zoo's polar bear Knut, who was brought up by his keepers after he was abandoned by his mother.
The need to hand-rear young and to remove tusks in captivity would reduce adaptability to conditions in the wild, and rate of increase in captivity would probably be lower than that expected in the wild, increasing the time to produce the required numbers.