A small finch with a red forehead that looks like someone dabbed paint on its head and walked away. The common redpoll is streaky brown above and pale below. Dark streaks mark the flanks. The male has a pinkish-red breast. The female is plainer. She lacks the bright colours. The red forehead is the giveaway on both. It is present all year. It is not a breeding feature. No one knows exactly why. Possibly display. Possibly something else. The bird is not explaining. It does not need to. It feeds on seeds, particularly those of birch, alder, and grasses. It also eats insects in summer. It clings to seedheads like a goldfinch. It is acrobatic and quick. A redpoll feeding on birch seeds in winter is determined. The seeds are small. The bird is hungry. It keeps working. The effort is constant. The reward is minimal. But it adds up. The bird survives on accumulation. It does not seek abundance. It seeks sufficiency. The call is a dry, chattering "chuch-chuch-chuch". It is often given in flight. Flocks call constantly as they move. It is a background noise that blends into the wind. In winter, redpolls gather in loose groups. They roam the countryside for food. They are not territorial. They are not aggressive. They just want to eat. The social structure is loose. It allows flexibility. It supports survival. The group moves together. It finds food together. It stays together. Redpolls are not native. They were introduced from Europe in the nineteenth century. They established well in the South Island. Particularly in the east. The North Island has smaller populations. They prefer cooler climates. The southern South Island suits them. The adaptation was successful. The distribution reflects preference. The bird found its niche. It kept it. It did not spread everywhere. It stayed where it was comfortable. Breeding takes it to shrublands and open woodlands. The nest is a cup of twigs and grass. It is lined with feathers and down. Four to six eggs are laid. The female incubates alone. The male brings food. The chicks fledge in about two weeks. The development is rapid. The independence is immediate. The parents work hard. The chicks grow fast. The cycle is short. It allows multiple broods. This increases success. In winter, redpolls dig tunnels in snow to reach buried seeds. They have learned that the snow insulates. They have learned that the seeds are still there. It is a small bird solving a cold problem. The technique is specific. It requires energy. It provides access. The bird uses the environment. It does not fight it. It exploits the insulation. It finds the food. The redpoll can survive very low temperatures. It fluffs its feathers. It shivers. It huddles with other redpolls. It does not migrate. It stays and waits for spring. That takes resolve. The endurance is physical. It is also behavioural. The bird accepts the cold. It adapts to it. It carries on. The population is widespread but patchily distributed. Numbers fluctuate with food availability. Birch seed crops drive the cycles. The bird responds. It keeps going.