Whales can live 50 to 100 years.
They are among the longest-lived marine organisms. However, the lifespan of different whale species is also different. For example, the lifespan of killer whales is relatively short, only about 30 years.
The lifespan of blue whales will be relatively long, probably around 80 years, and some can even reach 100 years. Additionally, human hunting and environmental pollution will have some impact on the lifespan of whales.
Different species of whales also have different body lengths. Common killer whales are not very large and their adult body length will be between 8 and 10 meters. However, they have fierce personalities and are already considered to be at the top of the marine food chain. There are also sperm whales. When they reach adulthood, their lonTheir body length will be between 11 and 20 meters and their weight can reach between 24 and 45 tonnes.
Blue whales will be bigger. The largest known blue whale is approximately 33 meters long and weighs approximately 180 tonnes. However, their body length is not fixed and will be affected by the environment and other factors.
Characteristics of whales:
The common characteristic of cetaceans is a constant body temperature, which is approximately 35.4°C. The skin is bare, without hair, only a few hairs on the tail, without sweat glands or sebaceous glands. Subcutaneous fat is thick and helps maintain body temperature and reduce body water weight. The skull is well developed, but the brain is small, the face is large and the forehead bone and maxilla are considerably extended, forming a very long snout.
The neck is not obvious, the cervical spine is healing and the tThe head is directly connected to the torso. The forelimbs are fin-shaped, the toes are not separated, and there are no claws. The elbow and wrist joints cannot move flexibly, so they are suitable for swimming in water. The hind limbs have degenerated, but there are still remains of the pelvis and femur, which appear in the form of remaining bone fragments.
The tail degenerates into a fin, and the skin at its tip extends horizontally to the left and right, forming a pair of large tail lobes, but they are not supported by bones. The vertebrae gradually shrink. long and narrow tail trunk, and finally enter. The caudal fin disappears before. The caudal fin is different from that of fish. It can move up and down and is the main swimming organ. Some species also have dorsal fins for balance.
Their bones have aspongy tissue and there is more fat in the body cavity, which can increase body size, reduce body specific gravity, and increase buoyancy.
Their eyes are small, without tear glands or nictitating membranes, and their vision is poor. There is no external ear shell and the external ear canal is very thin, but the hearing is very sensitive, it can feel ultrasonic waves and rely on echolocation to find food, contact companions or escape from enemies. There are 1-2 external nostrils, located at the top of the head, commonly called blowholes. Generally, the further apart the nostrils are, the greater the degree of evolution.
Breathe with your lungs. There are two lungs on the left and right. They contain numerous capillaries and can facilitate the circulation of oxygen and accommodate gas exchange at the water surface. need to surface from time to timeemps. You can breathe on the surface and dive longer. rib cageThere are 10 to 20 pairs. The stomach is divided into 4 chambers. The kidneys mostly look like a tumor. The testes of male animals are located in the abdominal cavity.
Females give birth and nurse in the water. The uterus is bicornuate and has a pair of breasts located in the cleavage on both sides of the reproductive slit. Milk is rich in calcium. , phosphorus and a large amount of fat. Young have teeth during embryonic life, but the teeth of baleen whales are replaced by baleen at birth, while the teeth of toothed whales are retained throughout their lives.
Sea anemones
Sea anemones are the longest-living marine animals in the world. Tests have shown that deep-sea sea anemones can live up to 1,500 to 2,100 years old. They even survive tortues and corals.
The sea anemone is a carnivorous cnidarian with a very simple structure and does not have the lowest level of brain foundation. Its tentacles can release toxins. It feeds mainly on plankton and has the longest lifespan. At 2,100 years old, it is one of the ten longest-lived marine animals in the world.