They’re sticking it where the sun-ray don’t shine. While remoras are known to be rather clingy, some are getting too close for comfort by diving into manta rays’ backsides, per a scientific probe in the journal Ecology and Evolution. “These fish are heading up right into some manta ray rear-ends,” lead author Emily Yeager, a marine researcher at the University of Miami, exclaimed on the Canadian Broadcasting Corporation radio show “As It Happens.” Known as “cloacal diving,” the “uncomfortable” practice involves flitting in and out of a larger critter’s cloaca — the multipurpose orifice used for both pooping and reproduction. This…