How do whales stay warm in cold water?

Whales stay warm in cold water through a thick layer of blubber beneath their skin. This fatty tissue provides insulation, retaining body heat in freezing temperatures. Additionally, whales have a counter-current heat exchange system in their blood vessels, minimising heat loss through their flippers and tails. Their large body size also helps them maintain a stable core temperature, enabling them to thrive in icy waters.