Heat production in fat tissue, a trait also known as adipose tissue thermogenesis, evolved over two stages in mammals, fully developing in eutherian mammals after the group’s evolutionary ...

Artist's rendering of Eomaia, an early mammal ancestor. Credit: Nobu Tamura/Wikimedia Commons “The revolution in DNA sequencing has provided us with enough chromosome-scale genome assemblies to permit ...

Another study focused on Early Cretaceous eutherian mammals, ... comprising extinct lineages that exhibit a mixture of primitive and derived mammalian characteristics.

How placentas evolved in mammals Research delves into the origins of pregnancy, pointing to an invasive placenta in the last common ancestor of eutherian mammals ...

The study included about 20 species, such as the egg-laying platypus, pouch-bearing marsupials, and a range of eutherian mammals that give birth to live young. The small subset is one limitation of ...

Platelet cells, which prevent mammals from bleeding non-stop, first evolved around 300 million years ago in an egg-laying animal similar to the modern duck-billed platypus, finds joint research by ...

The trait was passed on when the first groups of mammals -- including monotremes, the first mammal group, as well as marsupials and eutherian mammals -- diverged from the proto-platypus lineage.

Fossils of Some of Our Oldest Mammal Ancestors Found. Tiny teeth found in England belonged to the earliest known eutherian mammals—the group that includes dogs, elephants, and humans.

Researchers believe these are some of the oldest known fossils from the line of Eutherian mammals. Examinations unveiled that the fossils were 145 million years old.