He that had been so near seemed now as remote as their common mammalian ancestor.

This was probably a feature of the first mammalian ancestors, which were likely small, nocturnal, and burrowing.

"We still go through the ritual of courtship much like our mammalian ancestors," said Dr. Givens.

That is because both mice and humans inherited the genes from a common mammalian ancestor some 75 million years ago, in the era of the dinosaurs.

Man's earliest mammalian ancestor was a rodent - a tiny tree shrew with a long tail and a flexible spine.

The early synapsid mammalian ancestors were sphenacodont pelycosaurs, a group that also included Dimetrodon.

I do believe that we should catch fish, however, as opposed to dinosaurs or mammalian ancestors.

An individual fish that you catch and eat is less likely to be important than an individual dinosaur or mammalian ancestor.

Unlike their mammalian ancestors, githyanki reproduce by laying eggs.

Later research demonstrated that caseins already appeared in the common mammalian ancestor approximately 200-310 million years ago.