One of the first modern devices of this type was developed by Joseph-Armand Bombardier after a mission community begged him to invent one.  
The anthropologist Pertti Pelto examined the impact of this technology on herding cultures.  A kit sold by Virgil White included some idler wheels to convert a Model T into one of these things.  Helicopter inventor Igor Sikorsky invented a primitive one of these devices called the Aerosani.  The ISIA successfully lobbied the Canadian government to repeal a 75-decibel noise limit on these devices.  One of the first modern devices of this type was developed by Joseph-Armand Bombardier after a mission community begged him to invent one.  In 2013, athlete (*) Caleb Moore was killed while operating one of these things.  As of 2015, these things had to pass pollution and noise tests before being allowed in Yellowstone.  Arguably the first modern one of these devices was sold under the brand name of Ski-Doo.  For 10 points, name these vehicles that provide mechanized winter trail travel.
The anthropologist Pertti Pelto examined the impact of this technology on herding cultures.  
snowmobiles [or Snowflyers; prompt on sled; prompt or snowmachine] 