The Virus That Hacks Brains
Rabies does more than just cause illness; it actively rewires an animal's behavior to ensure its own survival. By inflaming the brain, it triggers aggressive biting, which spreads the virus to new hosts.
This virus specifically targets the brain to turn typically docile creatures into erratic attackers. Because the disease is almost always fatal, this behavioral manipulation is a desperate evolutionary tactic to reach the next victim. While we often associate it with mammals, even bird cells can be infected in controlled settings. It remains one of the most effective and chilling survival strategies in the natural world.
Source: Rabies in animals