The given image presents information about population changes in three types of mammals between 2011 and 2016 in North America, as well as nearby locations.
Overall, the most significant increase was observed in the bear population, while the dolphin population decreased over the period. The whales experienced the least amount of change. At the start of this period, the animals were ranked by population size, with dolphins in first place, followed by whales in second, and bears in third. However, by the end of the period, their rankings had reversed.
Specifically, starting in 2011, the bear population was estimated at about 10,000, but it has grown considerably over the years. By 2016, their numbers peaked at an astonishing 180,000. In contrast, the whale population fluctuated over the same timeframe. Their numbers remained consistent, recorded at around 70,000 in both the first and last years of the study.
As for the dolphins, their population showed a steady decline. In 2011, their numbers were noted at 150,000. Unfortunately, their population deteriorated significantly, and by the end of the period, there were no dolphins left.
