Before revision: However, while cats did not seem to be quite as good at this ' invisible displacement test ' as dogs are, it is hard to say whether their poorer performance is a true reflection of their abilities or just due to the way in which they have been tested.
After revision: However, while cats did not seem to be quite as good at this " invisible displacement test " as dogs are, it is hard to say whether their poorer performance is a true reflection of their abilities or just due to the way in which they have been tested.