A penguin pool is illuminated during a press preview of the first Christmas lights at ZSL London Zoo in the UK on November 22, 2018. A new Christmas light trail, featuring light up animal sculptures, will be one of the highlights at ZSL London Zoo this festive season. [Photo: IC]"

A golden lion is seen during a press preview of the Christmas lights at ZSL London Zoo in the UK on November 22, 2018. A new Christmas light trail, featuring animal sculptures that light up, will be one of the highlights at ZSL London Zoo this festive season. [Photo: IC]"

A pair of Giraffes during a press preview of the Christmas lights at ZSL London Zoo in the UK on November 22, 2018. A new Christmas light trail, featuring light up animal sculptures, will be one of the highlights at ZSL London Zoo this festive season. [Photo: IC]"

A Christmas light trail made of 365 recycled sleighs during press preview of the Christmas lights at ZSL London Zoo in the UK on November 22, 2018. A new Christmas light trail, featuring light up animal sculptures, will be one of the highlights at ZSL London Zoo this festive season. [Photo: IC]"