The graph shows population variation in three wildlife species from 2011 to 2016 in North America and its coastal areas. Summarize the information by selecting and reporting main features and make comparisons where relevant.

The graph illustrates the wildlife population of Bears, Dolphins, and Whales between 2011 and 2016. Units are measured in thousands.

Overall

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,

it is clear that

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in the first 3 years, the rank of each species always changed, and in the

last

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3 years, the sequence remained stable. Starting in 2011, the dolphin population was the highest, with the number exactly 150.

Then

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it decreased significantly by half,

although

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it was still the highest.

Then

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, in 2013, it had a moderate decrease to below 50, making it the lowest that year, followed by a substantial drop to almost 0. In the first period, there were only 5 bears. After that period, it witnessed a significant increase to more than 50, precisely the same as whales.

Then

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, it was increased significantly to almost 100 in 2013, before overlapping dolphins in the next period, exceeding 100. It had a steady increase until 2016, reaching its top below 200. Whales had a fluctuating population. Starting around 80, it decreased to the same level as bears.

Then

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, it rose moderately and reached its peak at exactly 100, becoming the most populations at that time. After that, it was surpassed by the bears and dropped moderately to more than 70.