Dec 22, 2021
The link between dinosaurs and birds has become even more clear! A rare, well-preserved embryo found inside a fossilized egg reveals striking similarities between dinosaurs and the birds they would evolve into, researchers say. The egg dates back more than 66 million years.
In a study published in the journal iScience, the authors reported that they discovered the embryo curled up with its head between its legs. Scientists used to think that position was unique to birds. The egg is 7 inches long and oval shaped.
The fossil also revealed a head and beak similar to that of a newly hatched bird. But the dino had tiny arms and claws rather than wings and could not fly.
One of the study's authors called the fossil “one of the best-preserved dinosaur embryos ever found.” The egg arrived at a nature museum in China in 2000 along with a large number of fossils. It took another 15 years for staff to realize what lay inside the egg. Scientists detected bones that had fossilized after the egg cracked. Careful analysis revealed the complete fossil curled up in its shell.
Discoveries of embryonic dinosaur fossils are very rare. They have been found at only about a half-dozen sites.
Photo from iScience.
The 6th Mass Extinction
This video discusses species extinctions, mass extinction events in Earth's history, and the current mass extinction event occurring on Earth.
Are We Living in the Sixth Extinction?
This video discusses the current and historic rates of species extinctions and the current and historic causes of species extinctions on Earth.
Peregrine Falcons
This coloring page and activity sheet gives information about the top speed of peregrine falcons, the areas they inhabit in Connecticut, and the formerly used pesticide that almost caused their extinction.