No, not the magically reanimated monsters, although the origin of the word is acknowledged here. These zombies are parasites, mostly worms and spores, that infect other living creatures and take over their bodies. The examples are numerous: a fungus infects a carpenter ant and sends it to the damp ground. The ant dies, and the fungus grows from its head, spreading spores that will infect other ants. Elsewhere, a snail eats bird droppings containing worm eggs that hatch; the worm takes over and forces the snail to climb up high, where it is eaten by a bird. The worm lays eggs, and the cycle starts again. Sound like science fiction? It gets weirder. A type of wasp hatches inside a caterpillar, eats its way out, and builds a cocoon, while, mysteriously, the caterpillar stays to stand guard. This is a very effective look at basic biology and the way parasites operate, and the detailed photographs, often gruesome, effectively highlight and validate the examples they accompany.