On the other hand, the average survival time for mammalian species over the past 20my has been 2.33my.

Colombia has more than 450 mammalian species - 7% of the world total.

The median duration of mammalian species is around 2.2 million years.

Human skin shows higher variation in color than any other single mammalian species and is the result of natural selection.

They are the only mammalian species to not have a vaginal opening.

There was also variation in different tissues and mammalian species.

Another area was the history of various mammalian species.

There are 64 known mammalian species in the area.

That's his upper limit, about the same as the average lifetime of many mammalian species.

Compared to mammalian species this number was eleven-fourteenth in total.