ACA TE PODES ENTERAR EL ORIGEN CUANDO TE SACAS LA FOTO DE " MIRA EL PAJARITO" (si sabes ingles te enteras)

Watch the Birdie!
In the 1920s, a brass birdie was often used by photographers to grab the attention of children during a portrait session (hence the saying "Watch the birdie"):
The birdie would typically be held by an assistant or parent. A rubber hose and squeeze bulb were connected to the short length of open brass tubing. The brass base separates into two halves so the bottom of the base can be filled with water. Squeezing the rubber bulb causes the bird to make a whistling and warbling sound.