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The kākāpō is the world's only flightless parrot and also its heaviest

the gist

The kākāpō is a large, nocturnal, ground-dwelling parrot found only in New Zealand, with owl-like forward-facing eyes and a facial disc like an owl's. It cannot fly, because on predator-free islands its ancestors lost flight muscles and kept a sturdy body instead. Adult males weigh roughly 1.5 to 3 kilograms, making it the heaviest parrot. It is also one of the longest-lived birds, with a reported lifespan of up to 100 years. Introduced cats, rats, ferrets and stoats nearly wiped it out. The Kākāpō Recovery Programme, started in 1995, now tags and names every known bird, and the total population was 325 as of 2026.

how it works

Predator-free islands let birds stop investing in flight, so their wing muscles shrank while their bodies grew heavier. Recovery depends on protecting every nest and chick and moving birds to islands free of predators.

so what

The kākāpō is one of the clearest examples of how invasive mammals can push a species to the brink. Its recovery shows that intensive, individual-by-individual conservation can work even when a species is down to a few hundred birds.

fun fact

The kākāpō is the only parrot known to use a lek breeding system, where males gather to display to females.

more on this

From Wikipedia, the free encyclopedia · text CC BY-SA 4.0

Image: Wikimedia Commons