Destination of Marvel

Types of Mammals

In terms of reproductive behavior, mammals fall into three groups- the egg layers, the pouched mammals and the placentals. The egg layers or monotremes, show several reptilian features and are... [[ This is a content summary only. Visit my website for full links, other content, and more! ]]

Mammals

Birds

Birds evolved from reptilian ancestors about 140 to 150 million years ago. The earliest known bird is the Archaeopteryx, several fossils of which have been found in Germany; about the size of a... [[ This is a content summary only. Visit my website for full links, other content, and more! ]]