Seabird deaths: Source of substance slick still unknown
3 February 2013 Last updated at 12:01 GMT
Rescue efforts along the south coast continue as hundreds of seabirds are affected by a mystery oily substance.
The birds, which are mainly guillemots and razorbills, have washed up along beaches between Cornwall and West Sussex since Thursday covered in the substance.
Dr Simon Cripps from Dorset Wildlife Trust spoke to BBC Breakfast's Jon Kay earlier about the latest rescue efforts.