Crayfish invasion in Niwot?

If you tread on Niwot trails regularly, this year you're likely to have frequently sighted some fun small critters – crayfish and Woodhouse's toads.

The word "fish" in "crayfish" speaks volumes as to why they drew the most attention when whatever body of water they crawled out from wasn't even in sight. Media reports of the "invasive Rusty Crayfish" in Colorado hit the headlines just as the number...