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Miro seeds were evacuated after an average of 38 hours, while it took five days for the weka to pass the hinau seeds.

They have no problem swallowing seeds, even big ones — like those in the fruit that falls from New Zealand’s hinau and miro trees, which can be about a centimeter in diameter.

They did this by embedding hinau and miro seeds with passive integrated transponder, or PIT, tags — the same devices used for microchipping pets.

The path passes through patches of native plants like silver beech and hinau trees and foreign species like California redwoods and Australian kangaroo paw flowers, then skirts around fields of children playing cricket and a rose garden with fiery species with names like Tropical Skies and Holy Toledo.

Among them towered up the poplar-shaped rewarewa and the hinau, whose fruit Mr. Mitford said was the favourite food of the parrots.