[Answer] 3. I am the loudest mammal, based on volume and length of each call, in the world. My sound is of a very low frequency and humans can't hear it.

Step 1 : Introduction to the question "3. I am the loudest mammal, based on volume and length of each call, in the world. My sound is of a very low frequency and humans can't hear it."

...1. Lion 2. Tiger 3. Elephant 4. Blue Whale The blue whale is the biggest animal on earth that is not extinct. This huge mammal is said to be bigger than most of the dinosaurs who roamed the Earth millions of years ago. Their calves weigh about as much as an elephant when they are born. A blue whale usually gives birth to only one calf at a time. The sperm whale's 'clicks' are louder but are of such short duration that most sources do not count them.

Step 2 : Answer to the question "3. I am the loudest mammal, based on volume and length of each call, in the world. My sound is of a very low frequency and humans can't hear it."

Blue Whale:

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