PAW Scotland state regarding bird of prey persecution for example:
Wildlife crime, especially that against birds, remains a significant threat to the conservation of a number of species in Scotland… This problem is increasingly well documented in the scientific literature and deliberate human killing has been demonstrated to be one of the main threats to species such as golden eagles, hen harriers and the reintroduced red kites… It is likely that those bird or mammal victims that are found each year are a small proportion of the actual deaths. Those engaged in this activity...