How do penguins stay dry in freezing waters?

Penguins stay dry in freezing waters thanks to their dense, waterproof feathers. These feathers overlap tightly, creating a barrier against water. Penguins also produce oil from a gland near their tail, which they spread over their feathers to enhance waterproofing. This combination of insulation and waterproofing allows them to swim in icy waters while maintaining their body temperature. Their streamlined bodies further minimise water resistance, making them efficient swimmers.