Review the following table and calculate the percent of change in number of U.S. threatened or endangered species listed between 2005 and 2014, both total and for each group. What is the total percent change? Which groups of organisms have experienced the greatest declines? Suggested reasons for these trends.

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U.S. Organisms Listed as Endangered or Threatened, 2005-2014 Type of organism 2005 2014 Mammals 78 90 Bírds 90 97 Reptíles Amphíbíans 36 36 21 31 Físhes 114 154 Insects 44 70 70 Clams 88 839 Flowering plants Other plants and 715 96 119 anímals Total 1264 1524 Data from U.S. Fish and Wildlife Service