  Primordial Black Holes (PBHs) are of interest in many cosmological contexts.
PBHs lighter than about 1012 kg are predicted to be directly detectable by
their Hawking radiation. This radiation should produce both a diffuse
extragalactic gamma-ray background from the cosmologically-averaged
distribution of PBHs and gamma-ray burst signals from individual light black
holes. The Fermi, Milagro, Veritas, HESS and HAWC observatories, in combination
with new burst recognition methodologies, offer the greatest sensitivity for
the detection of such black holes or placing limits on their existence.
