Mutagen vs Carcinogen Mutagen and carcinogen are two terms that have a lot in common. There is a potential that a single substance could be both of them at the same time and be only one of the two, as well.
A curb bit is a type of bit used for riding horses that uses lever action. It includes the pelham bit and the Weymouth curb along with the traditional curb bit used mainly by Western riders. Kimblewicks or Kimberwickes are modified curb bits, and a curb bit is used in a double bridle along with a bradoon.
As far as that particular horse being ridden in a curb bit, while it is impossible to tell exactly what type of bit is inside his mouth, the rider does maintain a nice loop in the rein and has seemingly soft hands (in the short video clip provided, at least).