Wildlife charities are calling for tighter regulations to protect seabirds from a group of chemicals that caused hundreds of seabirds to be washed up off the south coast of England.
The number of seabirds affected by the recent spill of polyisobutene (PIB) has now reached 4,000, said the RSPB.
The sticky chemical is used as a lubricant in ships' engines.
It is also moved in large quantities, as it is used to make chewing gum, adhesive tape and sealants.
The organisations are appealing to theInternational Maritime Organization (IMO) to "reclassify" the chemical.