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Oriental pied-hornbills nest in a suitable hole in a tall tree. The breeding pair seals the female inside the hole with a plaster of mud and fibres. The male gathers and delivers earth to the female, which seals herself inside the hole. A narrow slit is left open so he can feed her and the chicks. He brings them mostly fruits, insects, crabs and lizards, and sometimes, smaller birds. This remarkable behaviour is believed to deter large predators.