7) Euro coloration can vary a fair bit – In the past I assumed that Euros were always brownish in color (with their distinct banding pattern), since all the ones I’d dealt with had looked that way. I recently realized (when I started getting some from a new supplier up here in Canada) that they can actually be quite red in color, similar to Red Worms.
I think their diet can play an important role in this. I’ve noticed that previously-red Euros seem to gradually take on more of a brownish (even yellowish) color over time if they are feeding primarily on manure.