How deadly is a tarantula bite?

Usually is not.: Many species of tarantulas are not harmful to humans. If a tarantula bites it might be a “dry” bite – injecting little to no venom. However, the bite of some tarantulas can cause pain & swelling at the site, muscle cramping, fever, difficulty breathing and exhaustion. The Chinese Bird Spider (a type of tarantula) has been blamed for one death in China.

Not very: Unless you are allergic, a tarantula bite is just painful.