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The image illustrates the population size of breeding pairs of four wild bird species in Canada from 1992 to 2006, measured in thousands. American black duck data points in thousands: 80 (1992), 90 (1994), 100 (1996), 110 (1998), 100 (2000), 90 (2002), 89 (2004), 90 (2006). Blue-winged teal data in thousands: 50 (1992), 50 (1994), 60 (1996), 55 (1998), 58 (2000), 60 (2002), 63 (2004), 65 (2006). Canada goose data in thousands: 25 (1992), 25 (1994), 30 (1996), 35 (1998), 40 (2000), 43 (2002), 45 (2004), 50 (2006). Mallard data in thousands: 75 (1992), 80 (1994), 85 (1996), 90 (1998), 95 (2000), 97 (2002), 97 (2004), 95 (2006). The years span from 1992 to 2006, represented along the horizontal axis with eight specific years marked. Each line in the graph corresponds to one bird species, plotted against the vertical axis indicating thousands of breeding pairs.
Given the complexity of the image, the above description may not be entirely accurate.
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The line graph compares the population trends of four distinct species of four wild birds in Canada from 1992 to 2006.
Overall, the population of mallard and Canada goose witnessed an upward trend while the opposite was the case for American black duck as well as blue-winged teal. Among the four, the number of mallard’s population was the highest over the graph.
In 1992, the mallard had by far the highest wild bird population, at 80 thousands of breeding pairs. Far below were Canada geese, with 20 thousands pairs, closely followed by American black ducks, at about 18 thousands of breeding pairs. At the bottom of the list was blue-winged teal, with only around 10 thousand.
Thereafter, the mallard population increased, peaking at about 98 thousand pairs in 2000, but the graph shows that this number decreased slightly to around 83 thousand of breeding pairs in 2006. The population of Canada goose rose sharply, ending the period with 50 thousand. In the last place, American black duck and blue-winged teal declined slightly, as their corresponding figures stood at around 8 and 5 thousand of breeding pairs in 2006.
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