An interesting idea, 'bio-degradable' drones. This one has been constructed from a fungus in a mould lab! Seems to be partially designed to reduce carbon footprint, but also so an intelligence drone will degrade if it crashes and leave no trace.
Great closing line from the author,
"Trying to reduce our footprint on the environment is great, but methinks that a puddle of fungal goop with propellers sticking out of it might still be a giveaway that someone's been spying."