Crested mynas, as many other birds, are born altricially, which means young are underdeveloped at the time of birth, therefore fed by parents. When they grow up, they have to learn that food doesn’t simply jump into their beaks [📽️: Rebecca Gelernter]
This video (reduced to a 17 second gif) created by British psychological professor Richard Wiseman demonstrates the power of perspective in creating illusions. It’s titled, “Assumptions”