A three week old female White Rhino stands with her mother Tanda, 21 years, at the Ramat Gan Safari, near Tel Aviv, Israel, September 4, 2014 (UPI/Debbie Hill) | License Photo
The zookeeper was submerged in water when he was found by colleagues, officials said.
The man was treated at the scene by a Magpas Helimedix Air Ambulance crew and paramedics from the East of England Ambulance Service National Health Service Trust.
The zookeeper was taken by land ambulance to Addenbrooke Hospital "in serious condition," NHS paramedic Dave Tamarro said.
