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Eutherian Mammal (Noun)

Mammals having a placenta; all mammals except monotremes and marsupials.

Nouns denoting animals.

Placental mammals, also known as eutherian mammals, have a long gestation period, allowing their offspring to be fully developed at birth.
One key difference between monotremes, marsupials, and eutherian mammals is the structure and development of the brain and senses during embryonic stages.
Like other eutherian mammals, dolphins possess an anterior lobe that deals with brain growth.
Early humans hunted small game including lagomorphs and small rodents which were descendants of earlier eutherian mammals that dominated small-bodied species niches in both Late Paleocene.
To categorize certain specimens and attribute species into the monotremes, marsupials, and eutherian mammals category, primordial and extant, we can genetically compare species and their relevant traits and track evolutionary development.