Fat penguins wobble more when they waddle, says new study

A new study has found penguins have more of a wobblier waddle when they put on weight.

Researchers at the University of Roehampton, in England, studied a group of ten king penguins.

They measured the penguins' weight and studied their movements on a treadmill, finding that fatter birds were less steady on their feet.

The team think wobbly penguins may face greater danger from predators as they slide around and struggle to stay upright.