The CIA's Aquiline drone program was initially modeled on birds' flight characteristics but never became operational.
Notes on verification
Confirmed by CIA's own declassified documents plus independent corroboration from Wikipedia, Forbes, and The War Zone. All sources agree on bio-mimicry design basis and non-operational status.
Sources
- MK/ULTRA | CIA FOIA (foia.cia.gov) (cia.gov)
- https://www.twz.com/40966/the-cias-bird-shaped-aquiline-drones-could-still-be-caged-up-at-area-51 (twz.com)
- https://www.forbes.com/sites/davidhambling/2020/07/31/cia-reveals-details-of-bird-like-1970s-stealth-drone---with-planned-nuclear-propulsion/ (forbes.com)