Crab-eating macaque findings. One of the most well known examples of experiments on crab-eating macaques is the 1981 Silver Spring monkeys case. In 2014, 21,768 crab-eating macaques were imported in the United States to be used in experimentation. The crab-eating macaque has the third-largest range of any primate species, behind only humans and rhesus macaques. The IUCN Red List categorizes the species as Least Concern, and CITES lists them as Appendix II ("not necessarily threatened with extinction", in which trade must be controlled to avoid use incompatible with their survival). A recent review of their populations suggests a need for better monitoring
Subgenual organ response to vibration indicates that the organ undergoes resonance after stimulation, only slowly dampening. The sensitivity is correlated to the insect's own sounds. In the stick insects "Carausius morosus" and "Siyploidea sipylus", a highly developed distal organ is present in addition to the subgenual organ, but it contains less scolopidia than the subgenual organ. The organ itself has a semicircular shape inside the limb and is supplied by three different nerves, one of which also targets the distal organ. In both species, there are more than 40 scolopidia in the subgenual organ. Subgenual organ The subgenual organ is an organ