Sex dating sites in png
These are the only ratites known to exhibit this feature, which is also present in several other bird groups including swans, cranes, and guinea fowl.
The two other moa species that existed in the South Island; Pachyornis australis and Megalapteryx didinus might be included in a ‘subalpine fauna’, along with the widespread Dinornis robustus. australis is the rarest of the moa species, and the only one not yet found in Maori middens. Its name "upland moa" reflects the fact its bones are commonly found in the subalpine zone.There are many theories about the moa's arrival and radiation on New Zealand, but the most recent theory suggests that the moa arrived on New Zealand about 60 million years ago (Mya) and split from the "basal" (see below) moa species, Megalapteryx about 5.8 Mya instead of the 18.5 Mya split suggested by Baker et al. This does not necessarily mean there was no speciation between the arrival 60 Mya and the basal split 5.8 Mya, but the fossil record is lacking and is it most likely that early moa lineages existed but became extinct before the basal split 5.8 Mya.The Oligocene Drowning Maximum event, which occurred about 22 Mya, when only 18% of present-day New Zealand was above sea level, is very important in the moa radiation.Because the basal moa split occurred so recently (5.8 Mya), it was argued that ancestors of the Quaternary moa lineages could not have been present on both the South and North island remnants during the Oligocene drowning.This does not imply that moa were previously absent from the North Island, but that only those from the South Island survived, because only the South Island was above sea level. (2009) argued that moa ancestors survived on the South Island and then recolonized the North Island about 2 My later, when the two islands rejoined after 30 My of separation. also concluded that the highly complex structure of the moa lineage was caused by the formation of the Southern Alps about 6 Mya, and the habitat fragmentation on both islands resulting from Pleistocene glacial cycles, volcanism, and landscape changes.