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Researchers found that the third digit of the sparrow's length was 9.8 millimeters, which is 41 percent longer than its second longest digit, and 20 percent longer than its entire shin, reports Science News.
Paleontologists are not sure what the extra-long finger serves, but this may have helped the birds of the Cretaceous to find food in hard-to-reach places, such as holes in the trees. The bird may have been a resident of trees, and also used an extended claw to grab it to the branches.
The formation of his foot was so unique that the team of studying fossils, led by paleontologist Lida Xing from the Chinese University of Biological Sciences in Beijing, decided to announce a new species, naming the bird Elektorornis (amber bird) chenguangi. Their findings were published in Current Biology on Thursday.
The New York Times reported that the remains were undisturbed in hardened wood resin, while amber miners did not find fossil fuels in the Bay of Wake Bay in Burma in 2014.
She was first introduced to Chen Guan, the curator of the Chinese Hopage Amber Museum, and was initially suspected of having died out of the lizard.
However, Mr. Chen decided to consult Ms. Xing, who specializes in chalky birds, and the tiny creature was found to be associated with an extinct group of jagged, claws of birds called Enantiornithes, which was generous during the Chalk period from 145.5 to 66 million years ago .
"I was very surprised at that time," Dr. Sin told Times, reminding that the fossil was "no doubt a bird's eye".
Dr. Sing's team compared the size of the fingers with other well-known birds, starting with the Mesozoic era, which began 252 million years ago, and found that no other species had such a sharp difference in the size of the fingers.
Elektorornis chenguangi died out along with other species in its seven with non-bird dinosaurs at the end of the Cretaceous period.