Cook's petrel spends most of its life somewhere you will never be. This small, grey-and-white seabird breeds on a handful of islands off New Zealand, then disappears into the Pacific for months at a time. It does not announce its travels. It does not check in. It just goes. The plumage is grey above and white below, with a dark cap and a dark M pattern across the upperwings. The tail is grey with a dark tip. In flight, it looks like a tiny mollymawk, banking steeply and twisting through the wind. It is fast. It is agile. It is almost never still. Feeding happens at night. The bird plucks squid and small fish from the surface, often working in association with tuna and other predatory fish that drive prey upwards. During the day, it rests on the water or flies low to conserve energy. A nocturnal feeder. A daytime drifter. The schedule makes sense for a bird that wants to avoid predators. Breeding runs from October to May. Burrows are deep, sometimes a metre or more, dug into soft soil under the forest canopy. A single white egg is laid. Both parents share incubation duties. The chick grows slowly, fed on regurgitated squid and fish oil. It fledges in autumn, then disappears to sea for three or four years before returning to breed. Captain James Cook collected specimens during his voyages, giving the bird its English name. The bird did not volunteer for this honour. It was shot, preserved, and described. That was how natural history worked in the eighteenth century. The population crashed in the twentieth century due to introduced predators on breeding islands. Rats ate the eggs. Cats ate the adults. The birds declined. Then conservationists stepped in. Predator control and island restoration helped. The petrels responded. The population is now in the millions. On Little Barrier Island, the birds nest safely under the forest canopy. The island is predator-free. On Great Barrier Island, they are less secure. Rats are present. The birds persist, but the pressure is constant. Codfish Island also supports a breeding population. The call is a series of moans and purrs, heard only at night. On a dark evening on Little Barrier, the forest fills with sound. It is not birdsong. It is something stranger. A conversation conducted entirely in the dark. After breeding, Cook's petrel migrates to the eastern Pacific. It winters off the coast of Mexico and Central America. A New Zealand bird spending the southern winter in the northern tropics. That is a long commute. No one told it otherwise.