How long do salmon usually live?

Most salmon species live 2 to 7 years (4 to 5 average). Steelhead trout can live up to about 11 years.

Learn more: Questions and Answers about Salmon 

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Why do animals and plants become endangered?

Generally speaking, endangered species are those animals and plants that are in decline and may be in danger of extinction. A threatened species is one that is likely to become endangered within the foreseeable future. Learn more: USGS Threatened & Endangered Species