The above map shows the approximate locations of birds found affected by the sticky mineral oil, with the hotspot at Portland/Ferrybridge/east end of Chesil highlighted by the red star. Only locations are shown; there is no attempt to show numbers of birds reported from the various locations, but it demonstrates the wide spread of shore locations of affected birds.
Adam Grogan from RSPCA also told us that he received a report of a gannet and razorbill taken to a wildlife centre in Ostend, Belgium with a similar substance on them.
The original source of the contaminant remains unknown.