Higher classifications protect information that might endanger national security. Sleep deprivation also predisposes healthcare professionals to make mistakes that may potentially endanger a patient. Hybridisation may also endanger birds, damaging the gene stock. These activities endanger Natural World Heritage sites and could compromise their unique values. Terrorism is one of many threats that endanger society. Olinsky tries to prevent Lexi from becoming a witness as it would endanger her life. He chose anonymity to avoid any controversy that might endanger his diplomatic career. Breaking the law, these individuals endanger both themselves and their employers. His failures often result in crashes that lead to mass destruction and endanger Mrs. Puff. Under the wrong circumstances these currents can endanger both experienced and inexperienced surfers. Organized institutions that could endanger Syrian rule in Lebanon were systematically muzzled. Herbicides may endanger bird populations by reducing their habitat. Furthermore, the rescuers need not endanger themselves in conducting the rescue. While the campaign weakened Mitanni, it did not endanger its existence. There was some concern at the time that public knowledge would endanger the butterflies.