Crow is a general term for birds of the genus Corvidae in the passerine family, and is a common large bird. The body is larger, the body length is generally between 40 and 50cm, and the body feathers are mostly black with metallic luster. The beak is strong and black, the feet are also black, the wings are long and pointed, and the tail feathers are wedge-shaped. They are widely distributed all over the world, from cities to villages, from forests to grasslands. They are omnivorous birds, and their food includes insects, small animals, fruits, seeds, and carrion. It has strong adaptability and can survive in various environments. Known for being smart, with excellent learning and problem-solving skills.

Also known as black starling, a bird of the genus starling family. The body is large, 23-28cm long, black throughout, with a long and vertical feather cluster on the forehead, resembling a crown. The tail feathers and the overlying feathers under the tail have white end spots. The mouth is milky yellow and the feet are yellow. Sounds like starling, trained to imitate human language, is a famous cage bird. It feeds on insects such as locusts and flies, and also eats plant foods such as grains, plant fruits and seeds. It is a social bird that likes to move with its peers. It will form a group of dozens to hundreds of birds, forage and inhabit together, and maintain the relationship between the groups through complex communication methods.

It is a highly intelligent and social marine mammal belonging to the family of dolphins in the order of whales. Known for its friendly nature and spectacular behavior of leaping out of the water. The body is streamlined, the skin is smooth, usually gray or blue, and some species also have spots or stripes. Equipped with a highly developed sonar system, it can navigate and search for food in water. It is a social animal that often swims in groups and sometimes interacts with humans. The food mainly includes fish and squid. Dolphins play an important role in marine ecosystems, but also face threats such as ocean pollution, overfishing, and habitat destruction.