Dinosaurs and Mammals

[the mole]

Mammals and more mammals
Synopsis:

Prior theory: the number of mammalian species exploded about 65 million years ago, when the dinosaurs died out

Revised evidence: There was a major increase in the number of mammalian species about 100 million years ago, with individual animals all small.
There was another increase, smaller, about 65 million years ago, as the dinosaurs died out. However, almost all of those new species died out. leaving evolutionary dead ends.
There was another major increase in the number of mammalian species 50 million years ago.

New theory still being investigated, not explicitly discussed: dinosaurs died out because they trusted moles.