Seagulls are a group of seabirds belonging to the gull family in the order Characiformes. Seagull head and neck are white, back and shoulders are slate gray; The waist, tail feathers, and tail feathers are all pure white. The base is gray white or forms larger gray spots on the inner lining. The lower body is pure white. Humans believe that the call of seagulls sounds like "Europe, Europe", and "gull" is a onomatopoeic word that imitates this bird's call, hence the name. Seagulls are mainly distributed in northeastern, southern, and southwestern China, as well as in Europe, the Mediterranean coast, the Black Sea, Caspian Sea, western North America, including Alaska and the eastern Pacific coast, and even near the Tropic of Cancer.

Dogs are carnivorous mammals in the family Canidae, also known as dogs, and are referred to as the "six livestock" along with horses, cows, sheep, pigs, and chickens. The size and fur color of dogs vary depending on their breed, and their physique is well proportioned; The nose and snout are relatively long; The eyes are oval in shape; Two ears, either vertical or vertical; Limbs agile, with 5 toes in the forelimbs and 4 toes in the hindlimbs, with claws that cannot stretch or retract; The tail is circular or sickle shaped. According to Li Shizhen's "Compendium of Materia Medica", "Dog" means to knock. Dogs bark rhythmically, like knocking on objects, and some people say it is called a dog because of its roughness.

The Japanese macaque is a short tailed monkey that can grow up to 70 centimeters (28 inches) in length. It has a similar appearance to the Japanese macaque, but lacks the bright blue and red colors on its face. It has a high gender dimorphism in weight, with males weighing up to 20 kilograms (44 pounds) and females weighing up to 12.5 kilograms (28 pounds). The overall color is dark gray brown. Mature male has a pink lower lip, a white chin, a dark gray to black face, and a raised groove on the nose. The buttocks are pink, light purple, and blue. Female macaques do not have a pink chin.

The Swedish History Museum has a large collection of various bones, including human remains. The left and front sides of the skull are injured. There is a small square hole above the left eye and on the left cheekbone, which may be caused by a pole shaped weapon or a battle axe. The crack on the mouth may be caused by a sword or a thin edged axe. The skull is one of thousands of cultural relics discovered in a mass grave on the outskirts of Visby, Gotland Island. All the remains and items found at the site originated from the battle between Gothland farmers and Danish mercenaries on July 27, 1361.