know more about Dolphins

1. http://www.scientificamerican.com/article/how-do-whales-and-dolphin/
2. It is actually rare for a marine mammal to "drown," as they won't inhale underwater; but they do suffocate from a lack of air.
3. http://www.dolphins-world.com/dolphin-information/
4. http://www.whalefacts.org/can-dolphins-drown/
5. Breathe air (oxygen must be obtained above the surface of the water)
6. Warm-blooded (mammals tend to have fat/blubber in order to maintain their body heat and must consume adequate calories to stay warm and healthy)
7. Have hair (in addition to fat/blubber some mammals have hair to help them stay warm in cold climates)
8. Give birth (most mammals go through a pregnancy period and give birth to their babies; few species lay eggs)
9. Produce milk (most female mammals produce milk after their child is born in order to provide the child with nutrients, fat and calories so that it can remain healthy and grow)
10. The short answer to this question is, “yeswhales can drown underwater”, however in order to give you a more detailed and scientific answer we need to go further in depth about how these marine mammalsbreathe and how it’s possible for them to drown due to their aquatic environment.
11. http://mentalfloss.com/article/56538/how-do-dolphins-sleep-without-drowning
12. http://animals.howstuffworks.com/mammals/question643.htm