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The VERITAS array of imaging atmospheric Cherenkov telescopes has collectednearly 6000 hours of observations of active galactic nuclei (AGNs). It hasdetected 39 very-high-energy (VHE, >100 GeV) AGNs at redshifts up to z = 0.9,of which 24 are classified as high-frequency-peaked BL Lacertae objects (HBLs).VERITAS has obtained an extensive dataset of HBL, including extreme HBL (xHBL),observations, with lightcurves spanning up to 11 years, allowing thecharacterization of their long-term and short-term variability. A study ofvarious xHBLs/HBLs in the VERITAS dataset is presented, and the correlationwith other energy bands tested. In particular, the short-term variability ofxHBLs as a function of energy within the VHE band is examined, exploring thepossibility that secondary gamma rays are produced in cosmic-ray interactionswith background photons.

Variability Study of Extreme Blazars with VERITAS