 In terms of taxonomy, "Mohoua novaeseelandiae", shares the common name “brown creeper” with another species of bird found in North America, "Certhia americana", despite there being no recent lineages between the two species.Different brown creeper populations have different dialects, meaning that for example, a population on Stewart Island will have a slightly different song than a population at the foothills of Mount Cook.In a research project around the communicatory behaviour of brown creeper, it was discovered that a male brown creeper would respond more significantly (i.e., sing louder) around the presence of an unknown bird with the same dialect, than to a bird he recognised (a bird from a neighbouring territory).