I was looking through the research/scientific papers forum and I didn't see either of these review articles posted. If someone did post them already and I missed it, my apologies. The articles paint an unsurprising, but nonetheless frightening, portrait of the loss of the world's largest herbivore and carnivore populations, and the ecological ramifications thereof.
The herbivore article is open access, so anyone should be able to read it. The carnivore article is not, but I think if you google the title you will find that someone (not me) posted a PDF version online.