BDKRB2 and Anxiety: For example, previous studies showed that the Bdkrb2 gene is related to human anxiety [49], which suggests an association between Bdkrb2 and the sensitivity of GCO. According to field observations, GCO is very alert and sensitive and maintains a relatively long distance from humans, even when living in old-growth trees and bushes near villages that often have high levels of human activity.