wierd_world on Instagram: "Sharks and whales are often confused due to their large size and marine habitat, but they belong to entirely different biological classes. ​Here's a breakdown of the key differences: ​Whales: Marine Mammals ​Classification: Mammals (Class Mammalia) ​Breathing: Use lungs to breathe air at the surface. ​Body Temperature: Warm-blooded (endothermic), maintaining a constant internal temperature. ​Reproduction: Give live birth to young and nurse them with milk from mammary g