Animals That Asked People for Help #2

This dolphin got stuck in the shallow riverbed three miles away from the nearest sea. It is on the brink of death, since dirty stagnant water is not a suitable habitat. You can hear the dolphin make a distinctive whistle in hopes of someone hearing it. Thankfully, a human is nearby and he rushes to the rescue. People resuscitate the injured animal using whatever they can find. And later, it is returned to its native element.