Microplastics have been found in the guts of every marine mammal examined in a new study of the animals washed up on Britain's shores.

Researchers examined 50 animals from 10 species of dolphins, seals and whales and found microplastics in them all.

The number of plastic particles found in each animal was relatively low suggesting they eventually pass through the digestive system, or are regurgitated; however, researchers say the exact effect of microplastic on ocean life is still unknown.