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
Dōbutsu no Mori (film) of approximately ¥1.7 billion ($16,216,731) by the end of its theatrical run in 2007, making it the 17th highest-grossing film of that year when combining it with its December 2006 box office total. "Dōbutsu no Mori" was released on region 2 DVD in Japan on July 25, 2007 by VAP. First-print copies also included an "Animal Crossing"-themed carrying pouch. Dōbutsu no Mori (film) , also known as Animal Crossing: The Movie, is a 2006 Japanese animated film directed by Jōji Shimura and based on the "Animal Crossing" video game series. It was produced by Nintendo, OLM, Inc. and VAP and