I've noticed that lately we've had a lot of articles relating to Primeval and Prehistoric Park. This raises a big question: are they really needed?
The wiki was originally designed for the Walking with series. (I know PP is interconnected with all this, but in a complicated way.) The idea of other series pushing in isn't exactly the best thought.
Primeval, although it is created by the same people that made the Walking With series, isn't neccesarily part of the series itself. There are quite a few differences.
But this is really for the users to decide, whether they should be kept or not. The other two series have their own wikis as well.
In any case, The Paleontologist should have a big say as well, because he's the most active registered contributor.