 Pairs will forage together in their territory during the breeding season.It is also thought that sexual dimporhism in brown creeper, particularly beak size, reduces competition between individuals as a wider range of food is available to males which generally have larger beaks.Brown creepers are one of the main hosts for the long-tailed cuckoo in the South Island and Stewart Island and can sometimes be seen feeding a much larger cuckoo chick during the summer months.