At issue for the team was a central question: Are the whales able to find enough food? These whales, like their British Columbia southern resident counterparts near Seattle, eat Chinook salmon, which are far smaller than they used to be. (Some of the salmon runs are also endangered, the NOAA says.)
Here, two northern resident killer whales are photographed by the hexacopter. The whale on the left is in very poor condition and is thought by the researchers to have recently perished. The whale on the right, luckily, is considered healthy and in peak condition.
California Pot Farms Could Put Salmon at Risk