Snowy (character) he is able to understand human language, and communicates with speech bubbles. His verbal responses to various situations include jokes, expressions of fright, and pleas to Tintin to exercise caution. In the early albums he takes an interest in mechanics and geography; in "Tintin in the Congo", he makes biblical references. As a dog, he also sniffs, tracks, chases, and bites. The character of Snowy evolved through the course of the Tintin series. In early works he exchanges dialog with other characters, including animals, and provides a running commentary on the situation. His character then became affected by the introduction
Tintin (character) from his stories." It is this sense of humour that makes the appeal of Tintin truly international. "The Adventures of Tintin" was one of the most popular European comics of the 20th century, and it remains popular today. By the time of the centenary of Hergé's birth in 2007, "Tintin" had been published in more than 70 languages with sales of more than 200 million copies. The study of Tintin has become the life work of many literary critics, observers sometimes referring to this study as "Tintinology". A prominent literary critic of Tintin is Philippe Goddin, "Belgium's leading authority on