💨 Abstract

A new study reveals the internal structure of a 100-million-year-old fossil of Kryoryctes cadburyi, an extinct monotreme ancestor. The fossil, a húmero (arm bone), shows characteristics of the semi-aquatic ornitorrinco, such as a thicker bone wall and a smaller cavity, making the bones heavier and beneficial for aquatic animals.

Courtesy: wtop.com

Summarized by Einstein Beta 🤖