qT=2&tQ=Dolphin populations are threatened by...&tC=hunting.|pollution.|habitat loss.|fishing nets.|all of the above.&cC=5&fB=Sadly, many species of dolphin are threatened by hunting, pollution, habitat loss, fishing nets, and construction along coastlines and rivers. In 2000, many countries joined the International Dolphin Conservation program, hoping to reduce the number of dolphins killed by the fishing industry.<br><br>All species of river dolphin are at great risk, particularly China's Yangtze River Dolphin, which, with 50 individuals remaining, is among the world's most endangered species.