Custom-made auto clickers may have a narrower scope than a generic auto clicker. Chicken training is done using operant conditioning, using a clicker and chicken feed for reinforcement. Positive reinforcement training, sometimes accompanied by a clicker, is commonly used in this case. Clicker training uses almost entirely positive reinforcements. Clicker training can also be referred to as marker training. Sheep have also responded well to clicker training. A common critique of clicker training is that it is prone to the overjustification effect. She is a founder and proponent of clicker training. They can be trained to respond to a clicker. They learn to associate a clicker with a food reward of banana or banana-peanut paste. "Boing Boing" reviewed "Cookie Clicker" as a "highly-addictive browser game". Bogost has called "Cookie Clicker" "the logical conclusion of "Cow Clicker"". "Cow Clicker" received critical attention soon after its release. Cookie Clicker is an incremental game created by French programmer Julien "Orteil" Thiennot in 2013. Though the first version was coded in one night, "Cookie Clicker" is regularly updated.