You probably already know that the British army used horses, pigeons and dogs during World War One.
But did you know that they also deployed seagulls, sea lions, elephants and glow worms?
That's right - glow worms. Check out this lovely short, made to promote episode five of the BBC series 'WW1 Uncut' (watch the full programme here on the BBC iPlayer), which focuses on how our furry, feathered and glowing friends helped with the war effort.