Measuring 51 feet 6 inches in length, 40 feet 5 inches in width and 26 feet 10 inches in height, the world's biggest walking robot - Fanny - was unleashed by electronics maker Zollner Elektronik AG in Zandt, Germany, in September last year.
The mighty mechatronic beast is radio remote-controlled and was created to feature in Germany's longest-running folk play Drachenstich.
Fanny is an 11-tonne fire-breathing dragon powered by a 2.0-litre turbo diesel engine with an incredible 140 horse power, Guinness said.
Its main function is to act in a play, so veins are filled with 21 gallons of stage blood, while 24 pounds of liquid gas allow it to spit fire.
"Realising a radio remote-controlled, outdoor-capable four-legged robot walking robot in unheard-of dimensions, was what really motivated the developers and designers," a spokesman from Zollner Elektronik AG said.