A coalition of animal charities, including RSPCA and Peta UK, has written to ZSL London Zoo demanding an end to its Zoo Lates events, following media reports highlighting animal protection issues.

In a joint letter to David Field, zoological director of the Zoological Society of London, representatives from Animal Aid, Born Free Foundation, Captive Animals’ Protection Society, OneKind, Peta UK, RSPCA and Viva warn that the presence of visitors out of hours can have a “detrimental impact” on the animals.  

 “Zoos should be responsible for the safety of the animals in their care. Allowing these late-night events to continue when members of the public have claimed to see butterflies being crushed on the ground and birds in the aviary being ‘accidentally’ punched does not demonstrate adequate consideration for animal welfare,” they add.

Zoo Lates are evening events held at London Zoo, which is run by the Zoological Society of London. They involve a silent disco, comedy performances and the opportunity to see animals out of hours. Alcohol is also sold at the events.

Earlier this month the Guardian reported that London Zoo has confirmed an incident involving beer being thrown over a tiger, and another incident where a man stripped off in an attempt to swim with penguins.

Westminster Council has already asked the zoo for a full report and a petition protesting against the events has attracted nearly 75,000 signatures.

Field said: “While we appreciate organisations like this taking such an active interest in animal welfare, we can only reiterate that animal welfare is our top priority at all times. We go to great lengths to ensure the normal routines and behaviour of our animals are not compromised by Zoo Lates events, and that visitor behaviour is monitored and managed carefully.”

Field said ZSL has not received the letter. “When we do we will respond in an appropriate manner, not through the press,” he said.