Hundreds of birds have washed ashore covered in an oily, sticky substance believed to be polyisobutene (PIB), leaving the birds sickened or dead.

In a photo released by Korean Federation for Environmental Movement, a bird covered in fuel oil from the spill sits on the beach near Mallipo, South Korea. A recent PIB spill near the UK has caused hundreds of birds to wash ashore covered in the oily substance, sickened and dying.