how do they always find their way back?

Sorry, my cousin, you told me to write about "muuttolinnut ja Jallupullo". I have never seen either of those. But it seems to be important to you. So, can you brighten it up to me?  Migratory bird comes and goes, and I suppose that Jallupullo will do the same?  Was that the point? Best regards to Mike.