DallasColossal claimed a synthetic eggshell for moa embryos.
No hatching data were released; experts say the yolk, a single giant cell, cannot be enlarged without rupturing.
Independent researchers say the likely outcome is a gene-edited emu marketed as moa — which New Zealand Māori communities widely oppose.
Sources: New Scientist
WHAT THE MOA WAS
Nine species of flightless ratite birds endemic to New Zealand, the tallest standing 3.6 meters. Hunted to extinction by Māori settlers within roughly 150 years of arrival around 1300 CE — one of the fastest megafaunal collapses in the human record.
THE YOLK CONSTRAINT
A bird's yolk is a single cell — the largest single cell produced by any vertebrate. Scaling it up means the cell membrane must hold against its own internal pressure, which rises faster than surface tension can compensate. Above a certain volume the membrane ruptures before fertilization completes.
WHY IT'S NEVER A REAL MOA
De-extinction edits the genome of a living relative — for moa, the emu — toward extinct traits. The mitochondrial DNA, gut microbiome, and developmental environment remain the surrogate's. The result is a chimera marketed under the extinct species' name, not a resurrected lineage.
THE MĀORI OBJECTION
Under the Treaty of Waitangi (1840), Māori iwi retain rangatiratanga — chieftainship — over taonga, treasured things, which includes ancestral species and their remains. Reviving moa without iwi consent treats a taonga as corporate IP, bypassing the legal and customary framework that governs every other moa bone in New Zealand.
THE PRECEDENT
Colossal has previously claimed milestones for the woolly mammoth (a gene-edited Asian elephant project) and the thylacine. In April 2025 the company announced "dire wolves" — three gene-edited gray wolf pups with ~20 edits against a genome that diverges from gray wolves by millions of base pairs. Naming, not biology, did the resurrection work.
THE CONSERVATION CRITIQUE
Biologists argue de-extinction spending — Colossal has raised over $400M — competes with funding for living endangered species whose habitats are collapsing now. A revived moa would have no intact ecosystem to return to; New Zealand's lowland forests are 70% gone since human arrival.