R.A.F. men with their pet rabbits at a Squadron near the lines, France, c. 1918 "RAF men showing off their pet rabbits, France, during World War I. Lying underneath the fuselage of an aeroplane, these three RAF men parade their pet rabbits for the cameras inspection. Well known for their fondness of animals, British soldiers were keenly aware that keeping pets was an excellent way of maintaining a regiment's morale - hence the large number of regimental mascots adopted by British troops."
Source: National Library of Scotland.