Year: 1968
Type: article
Abstract: The mammals are an ancient division of the animal kingdom. They probably developed from reptile-like creatures in the early Triassic period, about 200 million years ago. Ever since then they have been changing to meet different and varying conditions of climate, enemies, and many other factors. Of the more than one million animals known in the entire animal kingdom, the 4,000 or so species of mammals represent a small minority.
Author: Jack D. Burke
Language: English
Subfield: Paleontology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2562077538