Which is more deadly: a black mamba or a death adder? Now readers can find out with this installment in the Head-to-Head series that mashes up deadly snakes from five continents. Each of the 20 serpent profiles features a description, color photo, and a sidebar of rankings in key categories. Friends flip to random pages and then "battle" one another in a chosen category. A great way to involve readers in natural history around the world.