You may have never heard of a velella before, but if you’re traveling to Cannon Beach or any of Oregon’s beaches in the next few days you may get a first-hand look at a lot of them.  Velella are also called “by-the-wind sailors” or “purple sailors” due to the discs they have on their backs that look like a small sail that helps them move through the water. They’re fairly small, about the size of a sand dollar, and live on the surface of the ocean, using the disc on the top of their body...