Bombyx mori 300 to about 900 m (1,000 to 3,000 ft) long. The fibers are very fine and lustrous, about 10 μm (0.0004 in) in diameter. About 2,000 to 3,000 cocoons are required to make a pound of silk (0.4 kg). At least 70 million pounds of raw silk are produced each year, requiring nearly 10 billion cocoons. Due to its small size and ease of culture, the silkworm has become a model organism in the study of lepidopteran and arthropod biology. Fundamental findings on pheromones, hormones, brain structures, and physiology have been made with the silkworm. One example of this was
Mori Chack Mori Chack Mori Chack (森チャック "Mori Chakku", born on March 23, 1973) is the artist name of a Japanese graphic designer, who was born in Sakai, Osaka, Japan. He is famous for his Chax product line, and especially the character Gloomy Bear, a 2 m tall, violent, pink bear that eats humans. The design is an antithesis to the excessively cute products produced by Disney, Sanrio's Hello Kitty, and other companies. Mori Chack believes that humans and animals are incompatible, and an animal is wild by nature. This is expressed most pronouncedly by the "Gloomy Bear", which is often shown