Boxing Day at the Zoo Start a new tradition this Boxing Day at ZSL London Zoo Kick off your slippers, move away from the sofa and put the selection box down; whatever your Boxing Day routine may be, its time to start a new one at ZSL London Zoo, where FIVE kids get in free with just ONE paying adult. Whilst the actual origins of Boxing Day may remain unclear, and celebrations vary, ZSL London Zoo is inviting everyone to celebrate and take part in its own December 26 ritual a fantastic family day out at the Zoo. Since ZSL London Zoo opened to the public in 1846, Boxing Day has proved to be a popular occasion to visit - providing a great chance to walk off Christmas dinner and get some fresh air in the company of the worlds most fascinating animals. This year between Sunday 26 and Friday 31, ZSL London Zoo, which recently took home the Visit London award for Best Tourism Experience in London, is running a fantastic offer where up to FIVE children get in free with just ONE full-paying adult. ZSL London Zoo is home to more than 750 amazing species, including komodo dragons, gorillas and meerkats. For a limited time only, up to five children get in free with one paying adult, when purchasing tickets online.