The once distinct neck vertebrae of cetaceans have fused, giving them a sleek, torpedo-shaped body that moves effortlessly through the water. Pinnipeds: The seals, sea lions, and walruses.
Social Structures in Dolphin and Whale Pods: Cooperation in the Deep
True marine mammals are those that depend on the ocean for their primary habitat and food source. Elephant seals and sperm whales can dive for over an hour, descending to depths where the pressure would crush a human lung instantly.
They can drastically reduce their heart rate, shunting blood away from non-essential organs and toward the brain and heart. The most famous adaptation is blubber, a thick layer of fat beneath the skin that acts as both a thermal barrier and an energy reserve.
Social Structures in Dolphin and Whale Pods: Navigating the Ocean Together
Their limbs have undergone a dramatic metamorphosis into flippers, providing the necessary lift and steering for navigation. Streamlined Forms and Limbs Transformed Efficiency is key in the marine environment, and evolution has stripped away features that create drag.
More About Mammals in water
Looking at Mammals in water from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Mammals in water can make the topic easier to follow by connecting earlier points with a few simple takeaways.
