Silbo Gomera – one of the endangered Canary Islands languages in which people communicate with La Gomera, off the coast of Morocco. The language is unique in that it is a whistle-like chirping birds. It is organized so that you can pass the usual language – in this case, Castilian Spanish communicate by whistling.
Long before the invention of the telephone islanders needed a certain method of communication, especially in an emergency or during hunting. This problem was solved by silbo where shepherds began to converse over long distances, through ravines and gorges. But even now, after the mobile phone whiz loses its relevance, because the island has a lot of places where there is no connection.