The given line graph illustrates the population distribution of three wild animals, including bears, dolphins and whales, both on landmass and in coastal areas of North America from 2011 to 2016.
Overall, it is well-distributed in the diagram that during 5 years the number of bears experienced an upward trend, while the population of other two species witnessed decreases.
Between 2011 and 2012, starting at the smallest number, the population of bears significantly rose from approximately 10 thousand to over 50 thousand individuals which was as much as the lowest number of whales in 2012. However, the figures for dolphins fell from 150 thousands to roughly 75 thousands in the same period. During the following year, the distributions of bears and whales rocketed to around 95 thousand and exactly 100 thousand creatures respectively, whereas dolphins’ population continued to decrease dramatically to over 25 thousand individuals. From 2013 to 2015, while the number of bears living in North America increased to almost 150 thousand, both whales’ and dolphins’ saw gradual deductions to approximately 95,000 and 6,000 respectively. Until 2016, the population of bears peaked at almost 200 thousand creatures while dolphins unfortunately became extinct after a slight decline, and the figure for whales witnessed a moderate downward trend to nearly 75,000.