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Red Swamp Crayfish.
This non-native crayfish thrives in the waters of the Santa Monica Mountains, eating the eggs of amphibians, disrupting fragile fresh water environments and hosting a variety of unwelcome parasites. A noticeable decrease in amphibians has been attributed to crayfish predation. Crayfish are continually introduced to the Santa Monica Mountains because of their utilization as fishing bait. Original public domain image from Flickr
Public DomainFree CCO U.S. Government image for Personal and Business use