I’ve seen plenty of Stentors swimming and plenty that are attached, but I hadn't seen one go from swimming around to attaching. So when I saw a Stentor swimming around the other day, I decided to try to watch it until it found a place to attach. Of course, since it was swimming around in a pretty thin wet mount, it might never attach. I’ll spare you the minutes I watched and only show the last two minutes of my vigil.
Images made through a microscope. All subject types.