I swear...My kids are blessed with the best grandparents EVER. (Both Sets!)
The last time Eric went down to the river, he was disappointed to find out that when the weather got cold, the crawdads disappeared. Well, Grandpa got on the Internet and read up on "crawdads in the winter," and found some instructions on how to "trap" them in the winter. Grandpa and Eric built this trap together!

It is cylinder shaped - each end is like a funnel. The top has a little door where they put fresh trout meat(so, they got to go fishing together for the trout first). The crawdads crawl in either end to try to get to the food(which is in side a wire box), and then they can't get back out.
They went down and put it in the river late the other night and went back in the morning to see if it worked - WELL, IT DID! There were 4 crawdads inside!!!
{the only problem was-that it was SO cold-that by the time they got home - the crawdads were completely frozen!}