One of the most amazing things that we did while on the Earthwatch Amazon Expedition was the Pink River Dolphin surveys. We quietly floated down the river and observed and counted the dolphins. We noted their GPS location and noted whether they were traveling, resting or fishing. The dolphins are a good indicator of the health of the river because they will only stay as long as there are fish to eat. They have no natural predators. Even the local people will not hunt them because of long held superstitions. This is a short video of the experience. In the background you can hear a toucan calling.
https://www.youtube.com/watch?v=I4SfZVUY_fQ
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