Why are Canadian polar bears pooping glitter?

Last updated at 12:04
Polar bear foodHolly Caruk/ CBC

The polar bears at a Winnipeg zoo in Canada are pooping glitter... we know.

Zookeepers have been adding different colours of the sparkly stuff, including purple, red and gold to food given to the polar bears.

Polar bear foodHolly Caruk/ CBC

It doesn't harm the animals, but it allows researchers to identify which sample came from which furry friend.

Tests have been performed on the droppings for two years to track levels of stress in the bears as they adjust to life at the zoo.

Glitter added to the foodHolly Caruk/ CBC

And they said only unicorns pooped rainbows...