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A man poured beer over a tiger at London zoo and was thrown out by staff during one of the attraction's 'Zoo Lates' events where alchohol is served.

The Friday night event also saw a man strip off and try to enter the penguin pool, in a separate incident reported in the Guardian.

Staff at the zoo have raised concerns about the event to bosses, saying it puts animal welfare at risk, the paper reported.

The late-night event has been hosted for several years on a Friday night, and has earned £800,000 for conservation work.

The zoo confirmed the tiger and penguin incidents and added that two years ago snakes were removed from an enclosure when a group on a night out cracked the glass.

A zoo spokeswoman told the Guardian she believed the events were safe. “We would ban alcohol if we thought it was necessary, but at the moment we see no need to do so.”

Chris Draper, programmes manager at charity Born Free, told the paper: "it is simply not possible to actively monitor the welfare of all the animals during public events, nor to eliminate the potential for problems. In my opinion, hosting events that expose animals to additional and unnecessary stressors is unacceptable.”