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Cubs came down from the hills due to the continuous intrusion by humans into their habitat
There are as few as 350 remaining in patches of forest on the Indonesian island of Sumatra
Cubs were brought to their cages in front of teachers and students from govt schools
Normally, litters of this kind of wolf--Canis lupus baileyi--max out at four
Two tigers will be returned to a sanctuary in South Africa if the other animals manage to settle
Pair was imported to city zoo from Canada in 2011
The cubs, born earlier this month, have weak immune systems and are unable to actively ward off infections