Missing species from the mammals app?

I was looking through the book version of the Mammals field guide and noticed that it covers 390 species, while the digital version lists 283 species. Does anyone know what species have been removed, or if they will be added at a later date?

We are aware of the species that are not currently available in our database. We are continually updating and adding content. These will be available in the near future. If you have purchased an app, these updates will be available soon as well.