A range of parasites, mostly small insects and arachnids, can create zombie-like hosts. No evidence exists to indicate that human zombies similar to those seen in movies and television shows are possible, however.
Some wasps in Costa Rica take over the bodies of Anelosimus octavius spiders and force them to build webs for their larva. Another example is the baculovirus, which causes caterpillars to climb trees until they dissolve and spray the virus across the forest floor. While it is theoretically possible that a highly contagious human virus could cause some traits seen in film zombies, such as uncontrollable rage or hunger, many of the traits of film zombies are physically or biologically impossible.