I recently heard from my friend that a flacon swoops down in a spiral (not spinning) motion to get a continuous view of its prey because it can see things clearly only in a 45-degree angle.(I don't know if this true, so please correct me if I am wrong.) I have even seen fighter jets doing the same thing (i.e. swooping down in spiral motion). Is there a reason why jets should move like that ? Is there a relation between movemont of a falcon and a jet ? and also What is a Vortex ? Please don't use heavy jargon, I'm just 15yrs old.