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Other animals don't move in water the same way fish do. but something that gave you from hong kong pause for thought and it's the topic of our viewer question. why do whales and dolphins swim by moving their tails up and down. while sharks by swaying side to side why some species of shark can swim at speeds of up to fifty kilometers an hour away was more sedate swimming at an average speed of twenty five kilometers an hour. dolphins can reach fifty five kilometers an hour. but the speed of sea creatures is not determined by their tail movement but rather the creatures size and shape. sharks an...

Aren't very good at moving sideways that's because they're descended from land mammals whose backbones didn't bend side to side but up and down in the course of evolution their back legs and tail were replaced by a tail fin. incidentally summering mammals are equally at home on land and on water . on like whales they don't have fins. but back to the question of why whales and dolphins have a horizontal tail fin it helps these air breathing sea mammals surface faster. if humans were aquatic they would presumably swim more like dolphins rather than sharks think about how we move when we use flip...

Whales aren't very good at moving sideways that's because they're descended from land mammals whose backbones didn't bend side to side but up and down in the course of evolution their back legs and tail were replaced by a tail fin. incidentally summering mammals are equally at home on land and on water . unlike whales they don't have fins. but back to the question of why whales and dolphins have a horizontal tail fin it helps these air breathing sea mammals surface faster. if humans were aquatic they would presumably swim more like dolphins rather than sharks think about how we move when we us...