The correct answer is option 4, Whale. A warm-blooded animal, also known as endothermic, is an animal that can regulate its body temperature internally, regardless of the external temperature.

Option 1: Anaconda, is a cold-blooded animal, also known as ectothermic. Ectothermic animals rely on external sources of heat to regulate their body temperature.

Option 2: Crocodile, is also a cold-blooded animal. Like the anaconda, it relies on its external environment to regulate its body temperature.

Option 3: Shark, is also a cold-blooded animal. It is ectothermic and relies on the surrounding water temperature to maintain its body temperature.

Option 4: Whale, is a warm-blooded animal. It has the ability to control its internal body temperature through metabolic processes, which generate heat. This allows whales to live in a wide range of habitats, including both warmer and colder waters.

Therefore, the correct answer is option 4, Whale, as it is the only warm-blooded animal among the given options.