iridescent green giant of the canopy

Size
Length: 50–55 cm, Weight: 550–850 g
Lifespan
10–15 years
Diet
Herbivorous. Feeds on leaves, buds, flowers, and fruit from native trees including kōwhai, pōhutukawa, tawa, tītoki, and karaka. Swallows fruit whole, then regurgitates or passes the seed intact, playing a vital role as a seed disperser for large-fruited native trees that no other bird can handle.
Habitat
Found throughout New Zealand, from dense native bush to suburban gardens with enough fruit trees. High-altitude gliders of the canopy, moving between fruiting trees. Often seen perched conspicuously on high branches, digesting meals with crop bulging. Prefers mature, diverse forests with year-round fruit supply.
Range
Found throughout the North and South Islands, Stewart Island, and the Chatham Islands in native forests, scrublands, and suburban gardens with fruiting trees. Most common in the central North Island, Northland, the West Coast of the South Island, and Fiordland.
Endemism
Endemic
Main Threats
Predation by rats, stoats, and possums is the primary threat, raiding their flimsy, stick nests and eating eggs, chicks, and brooding females. Also threatened by habitat loss from forest clearance, and by collisions with vehicles and windows.
Population
A unique, oversized branch of the pigeon family that evolved to handle the massive fruits of the Southern Hemisphere. The primary target of stoats, rats, and possums. Their survival is the key to the survival of the entire forest. The population is estimated at 50,000–100,000 birds, down from millions before human arrival.
Conservation Status
Not Threatened
The heavyweight champion of the New Zealand sky weighs up to 800 grams. It is one of the largest pigeons on Earth. The blueprint is built for momentum. A deep, barrel-shaped chest packs powerful flight muscles. Broad, rounded wings create a distinct, rhythmic thrumming sound as they beat the air. The plumage is a masterpiece of natural structural colour. Depending on how the sun hits, the back shifts from deep forest green to shimmering purple or copper. This contrasts against a crisp white singlet on the chest. The eyes and feet are a striking, vivid crimson. They give a look of permanent, intense focus. Usually on the next branch of berries. The design centres on an unrivaled throat. It is the only bird left in New Zealand with a mouth wide enough to swallow the big three fruits. These are pūriri, tawa, and taraire. The seeds are often the size of a small plum. The kererū gulps them down whole. It strips away the nutritious flesh in its massive crop. Then it delivers the cleaned seed to a new location. This is where the drunk and sober cycle comes in. Kererū love fermented fruit. They gorge themselves on pūriri berries until their crops bulge. The sugars turn to alcohol. The bird becomes famously tipsy. It is often seen wobbling on a branch or hanging upside down. Once it sobers up and flies off, it deposits the seeds in a rich pile of natural fertiliser. It effectively plants the next generation of giants. Biologically, the kererū is a vulnerable architect. Despite its size, it builds incredibly minimalist nests. Just a loose, flimsy platform of a few dozen twigs. You can often see the single white egg through the bottom of the nest from the ground. This makes them easy targets for climbing predators. However, they are surprisingly long-lived. They reach up to twenty years or more if they can avoid the stoats. They are the unseen hands that built the forest you walk through today. Without the kererū's messy, drunken flights, the great native trees would be stuck exactly where they stand. To see a kererū stall-turn into a pūriri tree is to see the master gardener of New Zealand arriving for a shift. It carries on.