At dawn in a North Island forest with intact predator control the kōkako begins. The song is organ-like. It is slow. It is resonant. It carries through the canopy in long phrases. Some people find it meditative. Others find it unsettling. This depends on what they brought to the forest. It is not a sound that blends into the background. It is a sound the forest at its best is built around. Callaeas wilsoni is a grey forest bird. It is roughly the size of a pigeon. But it is considerably more deliberate in everything it does. The legs are long and strong. The wings are short and rounded. Flight is limited to short gliding arcs between trees. It is not sustained travel. Adults carry bright cobalt-blue wattles at the base of the bill. These are small and pale in juveniles. They intensify with age. The blue becomes visible from a reasonable distance. The black face mask and dark bill give the head a defined formal look. The overall impression is of something ancient. It has thought carefully about its situation. It has arrived at an arrangement it finds acceptable. On the mainland kōkako require tall lowland podocarp-hardwood forest. Stands where tawa is a significant canopy component are preferred. The diet is dominated by leaves fruit flowers and buds. These are gathered slowly through the canopy and understorey. Kōkako are not strong fliers. But they are agile in trees. They hop between branches. They climb trunk faces. They occasionally drop to the forest floor for fallen fruit. Movement within a territory is extensive. It is systematic. Movement between territories is rare. This matters when managers think about population connectivity. The kōkako's trajectory through the twentieth century is instructive. By the late 1980s and early 1990s many populations had collapsed. Ship rats consumed eggs and chicks. Possums competed directly for food and foliage. Intensive predator control reversed that decline. Targeted translocations reinforced or restored populations across multiple sites. The current population stands at around 2300 pairs. This represents a genuine recovery from critically low numbers. DOC classifies it as Nationally Increasing. What that classification means operationally is clear. Kōkako do not maintain themselves without sustained intervention. Every breeding pair on the mainland exists because traps are being checked. Poison is being applied. The forest around them is being actively defended. The song carries a long way at dawn. Keeping it there is the work.