How come penguins don't slip and fall when they walk on slippery ice? Do their webbed feet provide friction?

The webbed feet help to increase contact area with the ice and to distribute the weight. The waddling also helps because it shifts the weight from one foot to the other. When all else fails they slide on their stomachs.

This is what I gathered from my reading.

The waddling probably results in the selection of a more consistent step width. Penguins such as the Adelie and Emperor in the Antarctic also have very strong claws that help them grip the surface of the ice.

Having watched the 3 part BBC programme on penguins - its is clear they do fall over on the ice!