They make an eccentric pair. The world's heaviest parrot – which also happens to be flightless – depends on the berries of a tall conifer tree for breeding, but the rimu tree can go for years ...

T HE KAKAPO, a cuddly bird that lives in New Zealand, is not designed for survival.Weighing up to 4kg, it is the world’s fattest and least flighty parrot. It mates only when the rimu tree is in ...