Woods Hole Oceanographic Institution (WHOI) in 2006 use passive acoustic recorders in an ocean glider, a type of Autonomous Underwater Vehicule (AUV) that looks like a large model airplane and can work at depths of more than 1,000 meters (about 3,300 feet).
Bowheads, aka. Greenland right whales, can live to 200
Here's the article. The data is mainly from eye tissue analysis.
Paradise: Monkey Mia, Australia
Dolphins by the beach (some feed humans)
World Leading Research: http://monkeymiadolphins.org/