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The first three critical months are when animal babies have to rapidly get to grips with their new family and the challenges of environment that surrounds them.

From around three months old, the animal babies can all get around on their own, but that means the impact of their environment and the struggle to find food really begin to hit home.

Approaching the end of their first year on Earth, the animal babies take on the most complex challenges of their lives. A mountain gorilla infant learns the co-ordination to roam free in the forest.