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 Subgenual organ The subgenual organ is an organ in insects that is involved in the perception of sound. The name (Latin "sub"-below and "genus"-knee) refers to the location of the organ just below the knee in the tibia of all legs in most insects. It is associated with sensing ground movement (less than 1 nm of displacement can be enough) and sometimes also of sound. Crickets and katydids have particularly well-developed subgenual organs which are associated with a tympanal organ on the tibia but probably don't share the same function. Lepidoptera and Hymenoptera usually have less well developed subgenual organs,