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
The Silkworm to stage his disappearance, rewrote "Bombyx Mori", killed Quine and framed Leonora for the crime. Tassel attempts to flee the party only to be quickly caught and arrested, which Strike and Robin planned in advance. Sometime later, Leonora is released from prison, Fancourt acknowledges the original "Bombyx Mori" manuscript's literary value, and Strike tells Robin that he enrolled her in investigative training courses as a Christmas gift. Much like "The Cuckoo's Calling", "The Silkworm" was met with critical acclaim, selling more copies than its predecessor in its opening weeks. Val McDermid from "The Guardian" gave the novel a positive review,