If the worms were originally in the leaves, then chances are that they are 'composting' worms as they were already working hard on breaking down the leaves. True 'earthworms' would have scooted down into deep burrows as soon as you disturbed the leaves. And they would be very unlikely to be above ground level during the day.
Not sure where you are, but most places have some kind of native composting worm, with E foetida or E hortensis being the most common.

Thanks for your response! I am learning so much about worms that I never knew--yes, they were in the leaves--I didn't dig into the soil and get them. I always thought they were the same kind of worms. So, these shouldn't hurt my bin? They are so much bigger than the red wigglers, will they eventually crowd out their smaller neighbors? I'm in St. Joseph, MO, so I see I'll have to learn those proper names and figure out which ones we have. Thanks again!
Karen

I started up a bin with some soil from near a stream that had earthworms and lots of other creepy-crawlies in it, about a month ago, and it's doing fine so far.

What I've learned so far is that a wide range of organisms in the box is good - even so-called 'competing' species - they won't wipe out my redworm population, and they'll help 'toughen up' the worms at the same time.

What does "toughen up" mean?