How does a frog breathe underwater?
By August most of the year’s baby tadpoles have lost their fishy tails and became long legged frogs. If you watched them grow up, you know that the tadpoles swapped their fishy gills for air breathing lungs. But the adult frogs still can breathe underwater when they wish. Most animals must take their oxygen from the air or from the water. A few thousand creatures, however, can do both, and almost all of them are the frogs and their amphibian relatives. A grown frog has a pair of little lungs high in his chest. He has a pair of small. Nostrils on his nose and an opening in his throat to carry air to his lungs. Mr. Frog uses his nostrils and lungs to breathe air when sitting on a lily pad of his pond or basking on the bank. When he croaks, he closes his big mouth and fills up with a breath of air through his nostrils. He adds his note to the night chorus again and again by passing this air back and forth over his vocal cords. He has a special method for taking his breathing oxygen from t
