Hakawai: a small Miocene shorebird from New Zealand

Hakawai melvillei was a small shorebird from the early Miocene St Bathans fauna of New Zealand. It was described from postcranial bones collected in lake-bed deposits around 19–16 million years old. The limb material places it among the Scolopaci, a group that includes sandpipers and their relatives, and the original phylogenetic analysis proposed a relationship with the Australian plains-wanderer lineage. That result made Hakawai an important early record of this southern shorebird branch. The bird's skull and bill have not been found, so its probing behaviour and detailed appearance remain inferred rather than directly observed. The extinct bird catalogue includes it among the ancient birds of Zealandia.

Quick facts

A new bird from the St Bathans fauna

Vanesa De Pietri, Richard Scofield, Alan Tennyson, Suzanne Hand and Trevor Worthy described Hakawai melvillei from the early Miocene deposits of Central Otago. The material includes 52 bones, with a right tarsometatarsus designated as the holotype. The type is held by Museum of New Zealand Te Papa Tongarewa; paratypes and referred elements are divided between Te Papa and Canterbury Museum. The collection documents a small wader through multiple postcranial elements rather than a complete articulated skeleton.

The name Hakawai draws on Māori tradition surrounding a mysterious night-flying bird called hakawai. The Miocene fossil cannot be identified with that later cultural being. The shared name is a naming choice, not evidence of continuity between a modern or historical legend and a fossil species millions of years older.

The deposits formed in the Manuherikia lake system, whose lake margin, streams, wetlands and surrounding forest contributed remains to the fossil record. Water can transport bones, so finds from the same formation do not guarantee the animals lived at one exact shoreline or at precisely the same time. The broad early Miocene age, about 19–16 million years, is based on the geological context of the beds rather than a direct measurement of the bones.

What the skeleton can and cannot show

The holotype is a right tarsometatarsus, the fused lower leg and foot bone that often preserves useful characters in fossil birds. Additional material includes other leg and wing bones. Their proportions and joint structures distinguish Hakawai from a generic modern snipe reconstruction and support its placement among shorebirds in Scolopaci. The fossil body itself is incomplete: no complete skull, bill, feathers or associated nest is known.

The original study compared the bones with living and fossil waders and proposed that Hakawai belonged near the lineage that includes Australian plains-wanderers and South American seedsnipes. It was presented as an early southern branch with a connection to the Australasian region. Later general summaries do not always use the same family rank, and some list the family as uncertain. The safest account is to retain the order-level shorebird and Scolopaci placement while clearly attributing the closer relationship to the published analysis.

The species has been described as small, roughly comparable in mass to a male plains-wanderer at about 54 grams. That number is an estimate from skeletal comparison, not a measurement of a living bird or a direct scale reading from a complete skeleton. Body mass is useful for conveying scale, but its precision should not imply that a whole-body fossil was found.

From wading ancestors to specialised lineages

Modern members of the broader group include birds with very different ways of life. Some are waders, while plains-wanderers and seedsnipes have highly terrestrial habits. The Hakawai bones were interpreted as evidence that its lineage retained an ancestral wading ecology before later specialisations evolved in its living relatives. This is an evolutionary reconstruction based on anatomy and relationships, not a direct observation of the fossil bird feeding.

Because the skull and bill are missing, the fossil does not show whether Hakawai probed mud, picked prey from the surface or used some other feeding strategy. A long bill in illustrations is borrowed from the appearance of modern relatives. It is plausible given the bird's placement among shorebirds, but should not be described as a preserved feature.

The same limits apply to its plumage, voice, breeding behaviour and exact flight capability. Wing bones form part of the referred material, but they do not reveal every performance measure of a living bird. No eggs or nest structure are known. The image of a small wader beside a lake is an informed scene-setting reconstruction, not a faithful portrait based on preserved soft tissues.

Why the fossil matters

Before Hakawai was described, New Zealand's pre-Quaternary record of this shorebird branch was poorly known. Its early Miocene age pushed the local record back tens of millions of years before the modern and historically known birds of the islands. The proposed relationship with Australian plains-wanderers and South American seedsnipes also adds a data point to debates about southern bird dispersal and the assembly of Zealandia's fauna.

The fossil does not establish that today's New Zealand shorebirds descended directly from Hakawai, nor does it prove that the same species persisted from the Miocene to human times. It could represent a side branch that later disappeared. The relationship of the fossil-bearing lineages to continental breakup and later dispersal is a hypothesis to test with more fossils and broader anatomical data.

St Bathans deposits contain many bird bones, and continued study may change the known diversity of the fauna. New material could clarify which bones belong to Hakawai, refine its phylogenetic position or reveal whether it had close relatives in the region. Until then, its strongest contribution is a named, anatomically distinctive shorebird that documents an unexpectedly deep history for this lineage in New Zealand.