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
The Adventures of Tintin 60 Years of Adventure" (1989), "Tintin: The Complete Companion" (2001), "Tintin & Co." (2007) and "The Adventures of Hergé" (2007), while English television producer Harry Thompson authored "Tintin: Hergé and his Creation" (1991). Literary critics, primarily in French-speaking Europe, have also examined "The Adventures of Tintin". In 1984, Jean-Marie Apostolidès published his study of the "Adventures of Tintin" from a more "adult" perspective as "Les Métamorphoses de Tintin", published in English as "The Metamorphoses of Tintin, or Tintin for Adults" in 2010. In reviewing Apostolidès' book, Nathan Perl-Rosenthal of "The New Republic" thought that it was "not for the faint