The fractional density excess of radio galaxies in the volume-limited sample (defined in Sect. 3.1). Top: the excess with respect to a volume-limited sample of non-radio galaxies (i.e., z < 0.03 and M_K <+−23.78). Middle: the excess with respect to normal galaxies drawn from the K-band luminosity function of radio galaxies. Bottom: the fractional density excess corrected for clustering induced by the morphological type of the host galaxies and their luminosity. Even after correcting for the clustering of their massive and predominantly early-type hosts, radio-loud jets are observed to occur in regins of high galaxy density.