Fig 7. Example of four bowhead whales (Balaena mysticetus) with mottled skin rubbing their bodies against boulders in Brown Harbour on 7 August 2016.

Animal (A) pictured rubbing the right side of its head on a boulder (S1 Movie) and animal (D) is using the rocks to exfoliate its chin. Evidence of prior rock-rubbing is apparent for animal (C) with long, thin lines running length and width-wise across the body.