  It has been thought that only light species could behave as radiation and
account for the dark radiation observed recently by Planck, WMAP9, South Pole
and ATACAMA telescopes. In this work we will show that GeV scale WIMPs can
plausibly account for the dark radiation as well. Heavy WIMPs might mimic the
effect of a half neutrino species if some of their fraction were produced
non-thermally after the thermal freeze-out. In addition, we will show how BBN,
CMB and Structure Formation bounds might be circumvented.
