This is just awful, but not uncommon.

On Sunday, a young, skinny 3.40m long male minke whale (Balaenoptera acutorostrata Balaneoptera) was washed up and died on a beach at Nieuwpoort, Belgium.
It was taken for an autopsy to Universiteit van Luik (University of Liège)
which was performed by Veterinarian Thierry Jauniaux. 400g of plastic was found in the stomach and an almost complete obstruction of the digestive tract, meaning the whale could no longer feed and died of starvation.