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Many factors contribute to the decrease in otter populations, and they can depend on the species. Over-hunting has reduced most species' populations at some point in time. Environmental factors also affect populations: pollution, especially toxic pesticide runoff, in otter habitats have severely cut numbers among North-American and Eurasian otters; oil spills as well as bacteria in feline fecal matter from San Francisco's poor sanitation system have killed off large numbers of sea otters; and human interference (including fishing, shipping, and automobile traffic) in otter habitats has detrimentally impacted most species' populations.

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16y ago

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