In the spring of 1928, the quiet village of Casterton in England found itself embroiled in one of the oddest legal proceedings of the 20th century: a formal trial against a swarm of house sparrows. The birds had infested the thatched roof and wooden rafters of the local parish church, causing significant structural damage and disrupting Sunday services with their nesting materials and noise. Rather than simply calling an exterminator, the eccentric local parish council and magistrate invoked an archaic legal precedent stemming from medieval ecclesiastic law, which permitted the trial and excommunication of animals accused of harming community property.
A formal summons was posted on the church door, citing the sparrows for willful damage and public nuisance. On the day of the hearing, a court was convened in the village hall. A local solicitor volunteered to act as defense counsel for the absent sparrows, arguing that the birds were acting under natural divine instinct rather than malicious intent.
The prosecution presented evidence in the form of ruined thatch and bird droppings collected from the pulpit. After a brief deliberation, the magistrate found the swarm guilty as charged. In accordance with the verdict, the court issued a sentence of banishment from church grounds, alongside a decree authorizing the parish wardens to systematically dismantle the nests and install protective wire netting.
While the birds naturally ignored the legal banishment order, the trial served as a fascinating late survival of animal trials in Western legal history.