Read the full story in Newsweek.
Populations of rusty crayfish, an invasive species in the lakes of Minnesota and Wisconsin, have seen a steady decline in some regions—and, for once, humans aren’t responsible.
A study published in the journal Ecological Applications on February 11 found that over a 33-year period, the rusty crayfish population in several northern Wisconsin lakes had decreased naturally without human input, dropping to nearly zero in four of the lakes.
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