I immediately informed the police and the forest department authorities and forest officers told me that they would tranquilise the leopard and shift it.

Source: https://www.canindia.com/kerala-leopard-on-prowl-trapped-in-chicken-cage-dies/

The drug - used by vets to tranquilise large animals and which lowers the heart and breathing rate to dangerous levels - had never previously been found in the UK.

Source: https://www.dailymail.co.uk/news/article-12127879/Sisters-agony-sibling-Britains-victim-horrifying-sedative-ravaging-cities.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Trying to tranquilise them can be dangerous as it can take a while for the drugs to take effect by which time the animal may have fled to the water and could possibly drown.

Source: https://www.nwemail.co.uk/news/23620813.piel-island-seal-discovered-plastic-ring-around-neck/?ref=rss