Funny story - There is a group of guys who walk around our neighborhood as security who blow a whistle to let us know all is well. It's part of the background noise to me, like the barking dogs and traffic sounds. About a month ago, Ju suddenly became aware of them and kept saying it was a bird ("passarinho"), and I kept telling him it was the "segurança." Finally last night when he heard the whistle, he said "bird no. Seguarança." A little while later we were looking at a book with a parrot in it, and I told him something like "it's a parrot, a bird that is a parrot" to which he replied "parrot no. Segurança." I love how kids' brains work.