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Male Humpback Whales sing the most complex song in the animal kingdom. A single song typically lasts ten to fifteen minutes! It is repeated over and over, but gradually changes composition. All whales in a population sing the same ever-changing song! No one knows how this is accomplished, or why! (source Whale Trust)
Also, Humpbacks have the longest appendage of any animal: it’s flippers! They can be up to 16 feet long, taller than an entire giraffe!