Here's why:

* Strong radio emissions: Pulsars emit incredibly strong radio waves, which are the primary way we detect them.

* Penetration of interstellar medium: Radio waves are good at penetrating the interstellar medium, which is the gas and dust that fills the space between stars. This allows us to observe pulsars even when they are far away.

* Early detection: Pulsars were first discovered in the 1960s through radio telescopes, which made them the first known type of neutron star.

While some pulsars emit in other wavelengths, including X-rays and gamma rays, radio observations are the most common and effective way to study them.