Do dolphins have blowholes?
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Dolphins have higher volumes of blood for their body size than do land animals, allowing for more oxygen carrying capacity during dives. Blood in the adult dolphin makes up 10-15% of its body weight, whereas in the human it makes up only 7% of the body weight. read more
Source: understanddolphins.tripod.com
Yes. Dolphins do in fact have blow holes. They are considered aquatic mammals, and can not breathe under water, so they go to the surface to inhale oxygen or to exhale excess water and carbon. read more
Source: qa.answers.com
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