**Author details**

Hussein Abdelhay Essayed Kaoud Cairo University, Egypt

\*Address all correspondence to: ka-oud@link.net

© 2022 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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