Juvenile and Adult Oriental Pied Hornbill

How do we differentiate between an Juvenile and an Adult Oriental Pied Hornbill? The left is slightly smaller and does not have that distinct pied form on its beak yet, while the one of the right is an Adult.  This photo was taken in Ubin Island in April 2010 nearby the NParks visitor exhibition center.
Juvenile(left) and Adult(right) Oriental Pied Hornbill

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