Swiss Civil Code

¹ If chat­tels are car­ried onto a per­son’s prop­erty by wa­ter, wind, ava­lanche or oth­er force of nature or by chance event, or if an­im­als be­long­ing to oth­ers stray onto his or her prop­erty, such a per­son has the rights and ob­lig­a­tions of the find­er of a lost ob­ject.

² If a swarm of bees flies in­to an oc­cu­pied bee­hive be­long­ing to an­oth­er per­son, the own­er of that hive ac­quires said swarm without ob­lig­a­tion to com­pensate.