Post 1 -Something goes wrong with the lungs/blowhole (Adam Mahmood)

There is a network of complex nerve endings that is located in the region of the blowhole. These nerve endings sense pressure changes so the animal knows when its blowhole is clear of the water and it is safe to breathe. When it is first born it has not yet developed the ability to interpret these pressure changes, so it must raise its head above the water surface before each breath. If the nerve endings never develop and the dolphin doesn't detect water covering its blowhole then it could inhale and die from getting water in its lungs.


http://understanddolphins.tripod.com/dolphinblowholeandbreathing.html