It is a very intelligent and adaptable bird species belonging to the crow family, widely distributed around the world. Known for its black feathers, sharp cries, and unique flying posture. The body is usually larger and has a strong beak, making it very suitable for pecking and tearing food. Food sources are diverse, including insects, fruits, seeds, small animals, and even garbage. Known for its problem-solving ability, the ability to use tools, and even the ability to remember human faces. It is a social animal that often moves in groups and communicates through complex vocalizations. Plays an important role in the natural environment, helping to control pest populations.

The heart is the core organ of the human circulatory system, located slightly to the left in the center of the chest cavity, roughly the size of a person's fist. By regular contractions and relaxations, blood is pumped to various parts of the body, providing oxygen and nutrients to cells while carrying away metabolic waste. The heart is mainly composed of myocardium, which has automatic rhythmicity and can autonomously control the heart rate and intensity. The four chambers of the heart include two atria and two ventricles. The right atrium and right ventricle are responsible for receiving and pumping blood to the lungs for oxygenation, while the left atrium and left ventricle are responsible for delivering oxygenated blood throughout the body.

It is a fish species that lives in the ocean and is known for its unique defense mechanisms and potential toxicity. The body is usually round or oval in shape, with smooth skin and a small body size, typically ranging from 10 to 40 centimeters in length. Having sharp teeth, suitable for chewing hard foods such as shellfish and crustaceans. One of the most well-known characteristics is its ability to expand. When threatened, pufferfish quickly swallow large amounts of water or air, causing their bodies to expand into a ball shape to scare away predators. This swelling behavior not only protects pufferfish from predators, but also makes them difficult to swallow. Pufferfish have toxins in their bodies.

Also known as firefly squid or firefly squid, it is a unique marine organism known for its luminescent properties. This small squid is mainly distributed in the waters of Toyama Bay and southern Hokkaido in Japan, and usually appears in spring. Small in size, with a body length of approximately 3 to 8 centimeters, possessing a transparent body and luminescent organs. The phenomenon of luminescence is caused by luminescent bacteria contained within its body. The firefly squid produces light through chemical reactions, and uses this light for communication, predation, and evasion of natural enemies. At night, the light emitted can illuminate the surrounding waters, creating a dazzling scene that attracts people's attention.

It is a peculiar fish that lives in the deep sea, named after its transparent head and unique tubular eyes. Their eyes can rotate, not only to gaze upwards, but also to look forward, helping them capture prey in the pitch black deep-sea environment. Small in size, usually only about ten centimeters long, feeding on small fish and jellyfish. The eyes contain green pigment, which can filter out sunlight shining from the ocean surface, making it easier for them to detect glowing jellyfish and other organisms. Their heads are surrounded by a transparent liquid shield to protect their eyes. Discovered for the first time in 1939, the pipefish remains an important subject of research for marine biologists to this day.

A seismometer is a precision scientific instrument used to detect and record vibrations on the Earth's surface. Not only can it help scientists monitor earthquake activity and predict earthquake risks, but it can also be used to study the internal structure and plate movements of the Earth. Plays an important role in the fields of seismology, geology, and geophysics. In addition, the data from seismometers also has important reference value for building safety, urban planning, and disaster prevention. With the development of technology, modern seismometers can provide more accurate and real-time earthquake monitoring data.

Also known as the Big Mountain Pepper Fish, it is an amphibian species belonging to the genus Giant Salamander in the family Heterobranchidae. Its body size is relatively large, second only to the Chinese giant salamander, ranking second in the world. The body length is generally around 60 centimeters and the weight is 25 kilograms; The largest individual can reach a length of 1.5 meters and weigh 45 kilograms. Mainly distributed in mountainous rivers in parts of Honshu to western Gifu, Shikoku, and Kyushu in Japan. They usually live in cold, rocky mountain freshwater streams and rivers, with a distribution range of 300 to 700 meters above sea level. I enjoy nighttime activities and use my sense of smell and touch to search for prey, including fish, salamanders, worms, insects, crayfish, and snails.

It is an ancient marine mollusk belonging to the order Nautilus in the cephalopod class. Known for its spiral shaped shell, which is not only beautiful but also has a unique structure, it is a miracle in nature. The shell is composed of multiple chambers, each connected by a structure called a "partition". By adjusting the gas and water inside the chamber to control buoyancy, one can freely swim in the ocean. They mainly live in tropical and subtropical coral reef areas and are nocturnal animals. They usually hide under the sand or rocks on the seabed during the day and come out to forage at night. Food mainly includes small fish, crustaceans, and other small marine organisms.

Also known as red salmon or red salmon, it belongs to the family Salmonidae and the genus Salmon. Living in the North Pacific and its surrounding rivers, it is a migratory fish species. Known for its bright orange red fish body and widely distributed migratory behavior. Every summer, mature red salmon migrate from the ocean to the freshwater rivers where they are born to lay eggs. This spectacular natural phenomenon has attracted the attention of numerous nature enthusiasts and tourists. After hatching in freshwater, they grow to a certain extent and swim towards the ocean, where they spend most of their lives. During migration, red salmon undergo significant physical changes, including darkening in color and growth in size.