Ancient DNA Reveals Giant Bird Was Common Crane, Not Extinct Species

Ancient DNA analysis has challenged a 150-year-old belief about a giant bird thought to have disappeared after the last Ice Age. Researchers at Bournemouth University (BU) discovered that enormous crane bones previously attributed to a distinct species, Grus primigenia, actually belonged to the common crane. This finding raises questions about the classification of other prehistoric birds as extinct species.

The mystery began in the 19th century when French biologist Alphonse Milne-Edwards examined large crane bones found in caves in southern France. He believed they represented a unique species and named it Grus primigenia. The remains were dated to the end of the last Ice Age and were long considered evidence of an extinct giant crane.

To investigate the bird’s identity, a team led by Dr. John Stewart analyzed ancient DNA from 18 crane bones recovered across England, Wales, France, Germany, and the Balearic Islands. Collaborating with the Centre for Palaeogenetics in Stockholm, the researchers used genetic evidence to determine the species of the bones.

“Previous studies had merely used the size and shape of the bones to attempt to understand these large birds. The use of DNA analysis has given us a more accurate picture of what they represent,” Stewart explained.

The genetic findings indicate that the oversized fossils belonged to common cranes rather than a separate extinct species. Stewart noted that differences in body size between male and female cranes may have led to the original misidentification.

The researchers plan to investigate whether changes in wetland habitats and human land use contributed to the reduction in crane body size. These remain possible explanations rather than established causes. The findings suggest that some prehistoric bird species identified primarily through fossil measurements may need to be reconsidered, as differences in bone size do not necessarily indicate separate species.