Ok I have looked at pictures of the two (native and signal) and I am not sure I would be able to tell the diff.
So can anyone point out an easy way to tell the difference for us 'duffers'?
I fancy the idea of trying to catch some with a string and bacon rind, but don't want to pull the wrong ones out!
Alan
You'd find it easier to tell in the flesh.
Natives have rough claws on top and signals have smooth claws, signals also have a white flash at the pincer joint.