 This will explain why brown creeper reject long-tailed cuckoo eggs and other species do not.The brown creeper, "Mohoua novaeseelandiae", is one of three species of bird from the "Mohoua genus", including yellowhead, "Mohoua ochrocephala" and whitehead, "Mohoua albicilla".Brown creepers however are the least known of the three species, despite being relatively common.