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We consider black holes in Lorentz violating theories of massive gravity. Weargue that in these theories black hole solutions are no longer universal andexhibit a large number of hairs. If they exist, these hairs probe thesingularity inside the black hole providing a window into quantum gravity. Theexistence of these hairs can be tested by future gravitational waveobservatories. We generically expect that the effects we discuss will be largerfor the more massive black holes. In the simplest models the strength of thehairs is controlled by the same parameter that sets the mass of the graviton(tensor modes). Then the upper limit on this mass coming from the inferredgravitational radiation emitted by binary pulsars implies that hairs are likelyto be suppressed for almost the entire mass range of the super-massive blackholes in the centers of galaxies.

Bumpy black holes from spontaneous Lorentz violation