Dolphin Blowhole and Breathing. Everything the dolphin does must be interrupted by its need to breathe. ... As a result of evolution, its nostrils slowly migrated from its nose (or rostrum) to the top of its melon (head), making it easier to breath when swimming or resting partly under water. read more
Dolphins don't have noses but they do have blowholes just like humans breath with their noses and dolphins breath with their blowhole so they dont have noses but have blowholes. read more