The last three chapters on humans wasn't quite as interesting. One thing I don't understand about invasive crabs is why don't they have fisheries and people go after them for food? The book moans a little about people eating too much seafood, making populations go down. Should do this with edible invasive species (there was a picture of the crab on a hand They look big enough to eat).
4 stars instead of 5 because I disagree with some of their "political" views - but if you believe we're all gonna die from global warming, and that the world is overpopulated and getting worse, you'll probably love the parts of the 3 last chapters that talk about that.