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The image depicts bird population data from 1990 to 2010 in thousands, showing crows beginning at 0.7 in 1990, dipping to 0.6 by 1995, holding until 2000, then declining to 0.5 by 2005, reaching 0.3 in 2010; kookaburras starting at 0.3 in 1990, peaking slightly near 0.4 by 2000, dipping back to 0.3 by 2005, ending just above 0.2 in 2010; parrots starting at 0.9 in 1990, declining to 0.7 by 1995, then further dropping to 0.6 by 2000, reaching 0.4 by 2005, and stabilizing around 0.3 in 2010; whip birds maintaining just below 0.4 from 1990 through 1995, then declining gradually to under 0.1 by 2010; swallows starting just below 0.2 in 1990, rising slightly between 0.2 and 0.3 until 2000, then declining sharply to 0.1 by 2010.
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The line graph illustrates the number of five different bird species in Wollai Park from 1990 to 2010. Overall, it is clear that most birds population decreased over 20 years. Despite starting at the middle, parrots became the top figure in the end of the survey.
In the beginning, the number of kookaburras experienced the most significant decline, dropping from 900 birds in 1990 to 300 birds in 2010. Crows also started at the same position with kookaburras then felt steadily by 100 birds to 800 in the last year. Besides, there was dramatic decrease in whip birds from 500 birds in 1990 to approximately 250 birds over 20 years.
Meanwhile, in spite of starting at 750 birds in 1990, parrots quickly increased to peak at 900 after 5 years, before dropping consistently to 750 by the end of the period. The number of swallows remained the lowest position throughout 20-year period. This figure gradually went down from 300 in 1990 to 200 in 2010.
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