Dinosaur news

[LandSeaLion]

A paper was published about a week ago by Hone at al detailing the discovery of a Microraptor zhaoianus with small mammal remains in its gut - the first example of a dinosaur eating a mammal ever found:

https://phys.org/news/2022-12-evidence-dinosaur-mammal.html

https://www.tandfonline.com/doi/full/10.1080/02724634.2022.2144337

Quote:An international team of researchers has found the first evidence of a dinosaur eating a mammal. In their paper published in Journal of Vertebrate Paleontology, the group describes their reexamination of a fossil found more than 20 years ago.

The work builds on the findings of a prior team who studied the fossil, Microraptor zhaoianus, back in 2000. It was found in the Jiufotang Formation in a western part of China. Back then, the research team dated it to approximately 120 million years ago, and noted that the fossil was missing most of its middle part but its rib cage was still intact.

Microraptors were three-toed dinosaurs that, like their larger cousins, were carnivores. They lived in trees and were quite small compared to other dinosaurs—about the size of a modern house cat. Some species of microraptors sported feathers, which might have been used for gliding down from perches in trees.

In this new effort, the researchers found evidence of another fossil inside of the microraptor that once belonged to a tiny mammal. A small fossil mammal foot was found just behind the ribs, proof that the larger creature had feasted on a mouse-size mammal.

The researchers note that prior research has shown that other small creatures have been eaten by dinosaurs, such as snakes, squamates and birds—but never a mammal. The researchers suggest the lack of mammal remains inside the stomachs of dinosaurs is likely due to the rarity of finding any remains of other creatures inside of dinosaurs, and not an indication that eating mammals was rare.

Artist impression (credit to Hans Larsson):

*This image is copyright of its original author

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