In half of the other adverts (tell me, which fraction is that of the whole?) bears are not chosen because they are what they are, but because they live in a cold and harsh environment or also because of their sometimes humanlike posture.
In most of the other advertisements bears stand for nature.
Notice that this is one of the very few (if any) advertisements where we can actually learn something about bears! Advert 28 also gives some information but it is clear that nobody took the effort to check the facts. We have more examples of car advertising: with Elephants (with minimal use of text, but still quite close to the book) and also several with Penguins.