PetMigrations

Night migrations: now and then a flock of a migrating species crosses the sky over a player and is gone after the crossing. The members are wild pets of the species on a migration route, so they look and animate like the pets, and a player who reaches one can tame it. Each player gets one roll per night, the first time the schedule sees them in that night; a won roll picks a moment in the rest of the night, and the flock starts then if the player is under open sky (otherwise it tries again until the night runs out). A flying species takes part through a migration: section in its pet file, as long as migrate is among its behaviors (the flying defaults include it); the schedule's own settings live in pets.yml.