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I agree with the anti freeze and cow crap but the slipperiest stuff I ever encountered was millions of frogs in a mass migration near Leech Lake, MN. Or the trillions of mayflies in a hatch on Mississippi River bridges
Along the Mississippi we have fish flies, sometimes called Mormon flies (I don't know why). They swarm by the billions for a few days and then die off en mass. Where I worked back in 67 the plant was at the end of a mile long blacktop, with a light pole and a right turn at the end into the plant. Fish flies swarm around lights. There were so many dead flies out there that the company sent an endloader down there to scrape them up into a pile. One of my supervisors turned that corner on his 350 Harley Sprint, and slide full bore right into that pile of dead bugs. Clean out of site under 10 feet of stinking dead flies. They are as slippery as guts, and stink even worse. He probably still has nightmares if he's still living.
Up here they call them May Flies, very slippery indeed!