Although, the passage about the wildlife in the city of Cologne does not mention cats, it is possible to encounter cats in Cologne since it is very common for people in western cultures to own cats and let them outside on their own. The reason cats are not mentioned in the passage is that cats are not considered wildlife but pets. This, of course, excludes species of "large cats" such as lions or tigers which you would typically not encounter in a city, unless you go to the zoo.