Deep in the rainforest, the monkeys are yodeling. Their wild calls echo across the foliage, sending signals of sex and survival. For decades, scientists have studied why they make these sounds, but ...

Humans have practiced some form of yodeling since at least the 13th century, when Marco Polo encountered Tibetan monks on his travels who used the vocal technique for long-distance communication. It’s ...

Researchers found that New World monkeys can produce extreme yodeling-like sounds by rapidly switching between their vocal folds (for low tones) and specialized vocal membranes (for high tones), ...