Can I keep earthworms?

[kibakiba]

I'm not the namer of these worms, all I know is the ones I have are collected from Canada... Hence, Canadian night crawlers

[guidofatherof5]

but in late spring on a warm rainy night, they are all over my street and driveway, ready to be picked up. Lucky I guess.

Be very cautious, worms collected from the street can be contaminated by automotive(oil,gas,transmission fluid,etc.) fluids. Driveways might be OK as long as there isn't any contaminates around.
I'm sure you are cautious but I thought I would bring it up anyway.

[ConcinusMan]

Don't worry, it's clean around here. When worms are on the streets, there's so much rain for so many days, everything gets washed away. Oh, and my car doesn't drip. No driveway slicks.

Very good point anyway.

[infernalis]

It is a great point, I roped off one of my swamp holes to keep ATV traffic out of it for just that reason.

These guys ride into the muck and get chain lube, engine oil and possibly even some gasoline in the water, contaminating the polliwogs and newts.