Jan 22, 2021 06:00:00

What is the new fact that can be seen from the fossil of the dinosaur 'butt hole' discovered for the first time in the world?

Much research has been done on the ecology of dinosaurs, including the reproduction

of the complete skeleton of Tyrannosaurus, but new fossils of the dinosaur's 'butt hole' in good condition have been discovered, and many things have happened. It is known.

A cloacal opening in a non-avian dinosaur: Current Biology
https://www.cell.com/current-biology/fulltext/S0960-9822(20) 31891-1

This fossil reveals how dinosaurs peed, pooped and had sex --CNN
https://edition.cnn.com/2021/01/19/world/dinosaur-fossil-sex-study-scn/index.html

1st preserved dinosaur butthole is'perfect' and'unique,' paleontologist says | Live Science
https://www.livescience.com/first-dinosaur-butthole-found.html

The following fossils discovered in China in 2002 are from the Cretaceous Psittacosaurus . Researchers have been paying attention to it because it is in good condition for a long time, but Jacob Bincer , a paleontology lecturer at the University of Bristol , happened to say, 'Oh, when I was doing research on dinosaur body color. I discovered that even the 'hole in the butt' was clearly fossilized.

The buttock hole of Psittacosaurus has a V-shape, which is similar to the anus of a crocodile, so it urinates, defecates, and reproduces like the

cloaca of birds and reptiles. Mr. Bincer speculates that it was used in action.

In addition, a small protrusion was found around the hole in the buttocks, and Mr. Bincer thinks

that he secreted an attractant from this protrusion and invited the other party during courtship.

In addition, melanin was detected around the hole in the buttocks. From this, it is pointed out that the color of the butt of Psittacosaurus is different from other parts, and it is possible that the butt was used for the same purpose as the monkey that threatens and courts with the red butt.

In addition, since the reproductive organs could not be confirmed in the fossil of Psittacosaurus discovered this time, it was not possible to distinguish between male and female. However, Vincer believes that Psittacosaurus and the crocodile had some reproductive copulation, similar to the crocodile, because of the similar shape of the crocodile's buttock hole.