In most of New Zealand finding a kiwi in daylight requires specific conservation programme or exceptional patience. Stewart Island is different. The Rakiura tokoeka is active during the day more often than any other kiwi species. Partly because southern summer nights are very short. Foraging time has to go somewhere. Partly because this island retains enough intact forest and low predator pressure. A kiwi can afford to be somewhat less cautious than its mainland relatives. The rules change here. Daylight is not forbidden. It is merely an option. The bird does not hide. It walks. It feeds. It is seen. Tokoeka are the largest of the southern brown kiwi. Stewart Island birds are substantial animals. Females can weigh over three kilograms. Plumage is rufous-brown with darker streaking. Bill is long and pale. Gait is that purposeful kiwi waddle. Covers ground more efficiently than it looks like it should. Unlike most kiwi some Stewart Island birds live in extended family groups. An alpha pair leads. Several helpers assist with territory defence. Occasionally with incubation. This arrangement is unusual. Nearest relatives insist on pair-only territoriality. Explanation remains incomplete. The social structure defies expectation. It is cooperative. It is complex. It works. Island accommodates wide range of habitats for single species. Birds occupy coastal forest. Sand dunes along western shore. Tussock grassland on Tin Range. Scrubby vegetation at mid-altitude. Territory sizes vary accordingly. Around five hectares in productive tussock. Fifty hectares on sand dunes where food is more thinly distributed. Southern two-thirds of island carries highest densities. Birds present throughout year. Chance encounters during daylight walks at Mason Bay become rule rather than exception. Visibility is high. Probability favours the observer. The bird is there. It is not shy. It is not hiding. It is living. Threat picture on Stewart Island is unusual for kiwi. Main South Island predators stoats and ferrets are largely absent. Feral cats are present. Kill some birds. Impact appears modest compared to stoat pressure affecting mainland populations. Real vulnerability lies in population's lack of experience with stoats. Naive population encountering them for first time would have no effective behavioural response. Biosecurity prevents stoat and ferret incursion by ship or floating debris. Priority status is maintained. Vigilance is constant. The threat is hypothetical but catastrophic. The fence is the line. The line must hold. Population at Mason Bay has been declining. Former farmland reverts from rough pasture to flax and scrub. Reduces open feeding ground. Rest of island appears stable. Estimated 13000 to 20000 birds make this most numerous tokoeka taxon. Number carries implied condition. Ongoing biosecurity work makes it possible. Without that work the numbers would drop. The island holds the line. The birds thrive within it. But the margin is thin. And the predators are waiting. Just offshore. Just beyond the fence. The boundary holds.