The distribution of the three bi-coloured fairywren species indicates their ancestors lived across New Guinea and northern Australia in a period when sea levels were lower and the two regions were joined by a land bridge.
三个细尾鹩莺物种的分布表明其祖先遍及新几内亚和澳大利亚北部，那时海平面较低，这两个地区是由大陆桥连结着的。