The Erodium Copy Robot is a bio-inspired, passive seed-delivery device that mimics the self-burial mechanism of Erodium (stork's bill) seeds — a genus of plants whose awned seeds use hygroscopic movement in the awn structure to drill themselves into soil when ambient moisture levels change with wetting and drying cycles — to create an autonomous, energy-free seed-planting carrier capable of deploying reforestation seed directly into mineral soil without human or machine intervention after initial aerial or ground-based dispersal. The biological inspiration is the Erodium seed's corkscrew awn, which coils and uncoils in response to changes in relative humidity, generating a rotational and axial force sufficient to auger the seed several centimetres into loose soil over successive wetting events, dramatically improving germination success by ensuring seed-soil contact and burial depth relative to broadcast surface seeding. Engineered copies of this mechanism — constructed from wood veneer, biodegradable polymers, or hygroscopically active cellulose composites — can be designed to carry a seed or seed pellet of a target reforestation species and, when deployed on a prepared or burned surface, autonomously embed the seed into the soil upon the first significant rainfall event. Research groups including teams at Carnegie Mellon University and collaborators have demonstrated functional prototypes capable of self-burial in laboratory and field conditions, with potential for mass production at low unit cost. In an Australian reforestation context, where post-fire recovery of native forests across millions of hectares and the aerial seeding of remote terrain for erosion and biodiversity restoration are ongoing priorities, rain-triggered self-burying seed carriers could substantially improve the success rates of aerial seeding programmes compared to unprotected broadcast seed, reduce the need for expensive follow-up helicopter or ground crews, and allow restoration seeding to be timed for delivery well ahead of the rain events that trigger burial and germination.