This is the seed of Erodium cicutarium (stork’s bill or filaree), which upon having contact with water will bore or drill itself into the ground in order for the seed to sprout. Watch closely as the seed will reverse itself several times, possibly to bury itself further in to the ground.
Erodium cicutarium is a herbaceous annual – or in warm climates, biennial – member of the family Geraniaceae of flowering plants. It is native to the Mediterranean Basin and was introduced to North America in the eighteenth century, where it has since become invasive, particularly of the deserts and arid grasslands of the southwestern United States. [source]
