I would really watch out on the 2s, sometimes they are fine one moment then something freaks them out and your face or head being the closest thing to them, the strike. Yikes, It really depends on the bird your placing onto of your shoulder. Both my boys i trust on mine, But then again, i take my boys everywhere and keep them social with people they know and don't know, for example, i take them to Petsmart or Petco where lots of people come around me to check them out, i also take them to my bird meeting where other members bring their birds and pass them around to people they know. neither one ever freaked out while on my shoulder but if I have them on my should while trying to eat or drink something, they do lung at my mouth trying to grab whatever I am eating or drinking so be careful, try to read their body language, don't place a bird that is over excited on your shoulder or your just asking for trouble. Best of luck. Joe