Przewalski's Horses, Yellowstone's Wolves and Finland's Wild Salmon

See the Wikipedia entry for Przewalski's horse.  The horses were a crucial part of the ecosystem and when they went extinct it became a desert.

15:19 Ecological economists calculated the value of each horse to the ecosystem, and it came to over US$47,000 per horse per year, just for being horses. 

See Wall Street Also Think this Whole Iran War Thing is Fake News. 

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And if you let the salmon back into the rivers then the bears get better food to eat,...

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So many stupid AI generated thumbnails! 

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