Crawdads... crawfish...
Here in Canada we call them crayfish.
Somewhere -- probably a movie -- I heard them referred to crawdads I knew that they were the same creature.
But the line in the book and the movie about them 'singing' had me second-guessing myself. Were they some type of bird then and I had some sort of false memory? Nope. Googling tells me crawdads, crawfish and crayfish are all the same critter.
So where does the expression 'crawdads sing' come from and what does it mean? Is it some sort of local slang or just some BS invented for the movie?