Section 6
Mammals
Book
Version 32
By Boundless
By Boundless
Boundless Biology
Biology
by Boundless
3 concepts
Characteristics of Mammals
Mammalian traits include, among others: specialized glands, modified jaw and inner ear bones, urinary bladder, and hair.
![Thumbnail](../../../../../../figures.boundless-cdn.com/19353/square/figure-29-06-02.jpeg)
Evolution of Mammals
The modern mammals of today are synapsids: descendants of a group called cynodonts which appeared in the Late Permian period.
![Thumbnail](../../../../../../figures.boundless-cdn.com/19354/square/figure-29-06-04.jpeg)
Living Mammals
Living mammals can be classified in three subclasses: eutherian, metatherians and monotremes.