The Boy at the End of the World by Greg van Eekhout

Apparently, this book hasn't been published yet, but I gave it rating of four out of five. The setting is many years in the future after Man has managed to destroy himself. However, a young boy survives in an ark and is awakened by his robot protector when the ark comes under attack. The boy, Fisher, is accompanied by the robot, Click, and a small woolly mammoth, Protein, as he searches for other humans. Fisher discovers the existence of a second ark, but must survive attacks by deadly machines, mutant crocodiles, and giant parrots. He travels along what used to be the Mississippi River in search of other human survivors. The human race will become extinct if Fisher is unable to complete his quest. However, the whole quest may be useless if no other humans remain.

The conflict is interesting, and the author has a good amount of action to keep readers interested. Fisher's group is an unusual blend of characters as Click keeps trying to stop him from taking risks, and Protein leads the way while eating and pooping most of the time. I like how the author had the three characters bond even though they were so different. Fisher risked his life several times while trying to save the robot. The conflict became more and more difficult to resolve, and the climax was suspenseful and unexpected. It's a good read for people who enjoy science fiction.