The signal crayfish is native to North American west of Rocky Mountain, habituating on rocky substrate rivers, streams or lakes. They are bluish-brown to reddishbrown in color with robust, large, smooth claws and can grow up to 6 inches long. They have a white to pale blue-green patch near the claw, like the white flags that signalmen used for directing trains—hence the name.

Authors: 
Tim Miller-Morgan
Product Number: 
ORESU-E-12-007
Year of Publication: 
2012
Price: 
NA
Length: 
1 pp.
Size and Format: 
8 1/2 x 11, online