A teenager was critically injured in an accident while out sledging.
The 16-year-old suffered "life-threatening" head injuries after falling off a toboggan at speed in Middlesbrough.
He was airlifted to hospital and is said to be fighting for his life.
A Great North Air Ambulance spokesman said crews were called to land near Flatts Lane Country Park at 1.25pm today.
The spokesman described the boy's injuries as life-threatening, adding: "He was given an anaesthetic at scene before being transported to the James Cook University Hospital in Middlesbrough in a critical condition."
Zoo animals across the UK have been enjoying the winter weather as a blanket of snow covered much of the UK.
A man today transformed an armchair into a toboggan to take full advantage of the winter snow in Norfolk.
Scores of people have been sending in snow pictures to ITV News and here are some of the best snowmen photos.