Melissa Lowery was out on the lookout for dinosaur fossils at a spot on Australia’s south coast the place she’d discovered scores earlier than, when she seemed down at her ft.
“The shadows fell into these attractive little shapes, they have been so acquainted. I stood watching these shapes for round 10 minutes,” says Lowery, a volunteer fossil hunter.
She reached down and positioned her hand into one of many shapes. “It was a second of pure pleasure and whole surprise as I realised that I had discovered some footprints.”
What Lowery had discovered on the rocky flats at low tide was what scientists say is the oldest identified proof for historic birds within the southern hemisphere – impressions of footprints which have survived for between 120m and 128m years.
The invention of the 27 chicken tracks – initially thought to have been made by dinosaurs – are at a spot that might have been near the south pole and a part of the Gondwana super-continent that included Antarctica after they have been made.
Prof Anthony Martin, a palaeontologist at Emory College in Atlanta, was despatched photos of the tracks by Lowery after she discovered them in the summertime of 2000.
Martin, who’s a lead creator on a scientific paper describing the invention, says he initially thought they have been small dinosaur tracks just like others present in the identical area.
However after a Covid journey ban lifted, he went to the location close to the Victorian city of Inverloch, about 150km east of Melbourne. Inside a few days, he was satisfied Lowery’s dinosaur tracks have been really chicken footprints.
“As an avid chicken watcher for a few years, to listen to that I had discovered the footprints of birds was completely superb,” says Lowery, who volunteers for Dinosaur Dreaming, a joint challenge between Museums Victoria, Monash College and Swinburne College of Expertise on the lookout for dinosaur proof.
Martin used a guidelines to differentiate the tracks as birds, together with how the prints had three forward-facing broadly unfold toes at an angle larger than 90 levels, with sharp claws and a few with a particular claw for perching.
The birds had presumably migrated there for the spring or summer season and have been doubtless about the identical measurement as a modern-day heron or oystercatcher.
“We’d have recognised them as birds – a small and feathery animal with a slight construct,” Martin tells Guardian Australia. “However as you stared at it, it could look weirder and weirder.
“It will open its mouth and you’d see enamel. And it has a tail, with no tail feathers. You’ll see it’s a transitional animal from its dinosaur ancestors.”
Martin says the tracks are the earliest proof of birds in Australia, the southern hemisphere and the traditional Gondwana continent.
“This reveals us when birds arrived there. We expect birds originated about 160 to 150 million years in the past within the northern hemisphere,” he says.
The earlier earliest identified proof for birds in Australia was from a 105m-year-old fossilised bone additionally discovered near the location of the tracks. The primary Australian dinosaur fossil was found on the similar web site in 1903.
The footprints are solely seen at low tide however are being eroded by the day by day tides. Over the course of 18 months, the examine says seven of the tracks had been erased, however not earlier than images and casts have been made.
Dr Tom Wealthy, senior curator of vertebrate paleontology at Museum Victoria’s analysis institute, says: “With a footprint, you already know the animal was proper there. A bone can transfer, however a footprint can’t. If you discover dinosaurs and chicken footprints collectively, you already know they have been contemporaneous.”
Wealthy has been learning the location together with his spouse, Patricia Vickers-Wealthy, of Monash College, for about 40 years. Each are co-authors of the examine within the journal PLOS One.
“This is among the few locations the place you’ve got fossil data of birds and dinosaurs [together] dwelling in a polar area,” Vickers-Wealthy says.
Wealthy says as soon as a chicken has made its mark on the mud or sand, the impression should have been shortly coated by sediment.
Finally the mud turned to rock and sank as a lot as 2km, earlier than being pushed as much as the floor as mountains fashioned, leaving the prints uncovered on the present web site.
