Fast Shipping! Orders placed Monday to Thursday are shipped within 24 hours. Orders placed on Friday may ship on Monday. Shipping method depends on the type & number of items ordered. Does not apply to framed posters. Read more...

Framed posters at low prices! Our framing is done in-house so you don't have to wait weeks to get your order. We offer the best value for quality metal poster frames. Read more...

About Us: Online since 1997, with many thousands of satisfied customers, 123Posters is the safe, reliable place to shop for posters, prints, and framed art. We are located in Northern California. We offer everyday low prices without gimmicks, a full no-quibble money back guarantee, & top notch service. Family friendly web site, too. Read more...

You are here: Home Nature/Science Evolution Mammal Evolution

Mammal Evolution Poster

Mammal Evolution
Content-Intensive Poster
Item: EDU63
In Stock: Yes
36 x 24 in.

Mammals are an outstanding example of adaptive radiation, the process by which organisms evolve into a multitude of new forms. This poster explores that subject, and it shows the results. It begins with the first tetrapods (terrestrial vertebrate), then it shows and explains how they evolved into three basic groups based on skull characteristics. The synapsids were the last group to evolve, and they were the most advanced. They evolved around 324 million years ago. They are often referred to as the “stem-mammals” or “proto-mammals.” They were the dominant and largest terrestrial vertebrates during the Permian, 299 to 251 million years ago. Changes in the planet resulted in their mass extinc- tion. The reptiles adapted to fill the ecological niches they left behind. The result was a world dominated by dinosaurs. The earth changed again around 65 million years ago, and the dinosaurs became extinct. The few surviving synapsids adapted into modern mammals, which are also classified as synapsids.