**4.2 Pinnipeds**

The pinnipeds are a group of 33 species of aquatic fin-footed mammals composing three families (**Figure 3**) [4]:

**Figure 3.**

*The pinnipeds are a bunch of 33 species of aquatic fin-footed mammals composing three families.*

*Introductory Chapter: Marine Mammals of the World DOI: http://dx.doi.org/10.5772/intechopen.105110*


Pinnipeds live in some inland or tropical freshwater systems and rich marine environments.

#### **Figure 4.** *The Sirenia commonly spoken as sea-cows or sirenians.*

**Figure 5.** *The sea otter.*
