wiggler size. Euros SHOULD be about 3" long, real thick, and really chunky looking.. basically about 50% longer and 3 times thicker than those. I'd take a pic of mine but its pouring down rain and I don't feel like getting wet to go to the worm bins LOL.
Those could be euros, just really small.. they are almost impossible to tell the difference for the average person.. sometimes euros are a little more darker and purple-ish on the top side. If you had wigglers and euros together, the wigglers will almost always take over.