How does rubbing oil on its outer feathers affect a penguin?

Penguins have natural oils on their feathers that help them stay waterproof. Rubbing additional oil on a penguin's feathers can disrupt this natural layer and cause the penguin to lose its waterproofing. This can lead to the penguin becoming waterlogged and losing body heat, which can be fatal. In addition, rubbing oil on a penguin's feathers can clog its pores, preventing it from properly regulating its body temperature. This can also lead to the penguin becoming ill or even dying. For these reasons, it is important to avoid rubbing oil on a penguin's feathers.