Silbo Gomero, spoken by the inhabitants of the Canary Islands, is the simplest language on this list. It has an "alphabet" of just two vowels and four consonants. Finally, a culture that appreciates simplicity! But if you want to speak it, you'll need a really keen ear and outstanding breath control, because Silbo Gomero is a language articulated entirely by whistling.
The modern language is a variation of the one used by the indigenous Africans who once populated the islands. The Canaries were claimed by the Spanish, who all but wiped the original inhabitants out, because that's just how imperialism rolls. But the Spanish settlers were enamored with their unique way of communicating and adapted it to their own language. And they're really serious about it -- the whistling language is a mandatory part of their school curriculum.
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Kindergarten classes involve a lot of raspberries and spittle.
The English language has two things that can be expressed by whistling, which translate to "I am impressed by that," and "Would you kindly shake it, strange woman." But Silbo Gomero is complex and nuanced enough that whistling can be used to communicate news and announce celebrations over the vast distances. The indigenous farmers of the islands can hear a skilled whistler up to two miles away, making it well suited to the mountainous terrain of the region. When you're working at the top of a ravine and you spot some Lothario out with your wife a mile below, you can explain in detail via a jaunty tune how you're going to replace his ass with his face.