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“The great auk will always hold a place in my heart,” Dr Jessica Thomas says.

The Swansea-based scientist spent years piecing together an ancient DNA puzzle that suggests hunting by humans caused this giant seabird’s demise.

Dr Thomas studied bone and tissue samples from 41 museum specimens during a PhD at both Bangor and Copenhagen University.

The findings paint a picture of how vulnerable even the most common species are to human exploitation.

Storybook seabird

About 80cm (2ft 7in) tall, the stubby-winged and bulbous-billed great auks used to be found all across the north Atlantic – from North America through Greenland, Iceland, Scandinavia and the UK.

“Being flightless, they were always targeted by local people for food and for their feathers,” says Dr Thomas.

“But around 1500, when European seamen discovered the rich fishing…