Do any animals sing?

Monogamous titi monkeys sing their hearts out, but only in a duet with their partner

Every morning at daw, a pair of titi monkeys wakes up to sing a duet. This song helps establish their territory, and neighbouring pairs often return their call with a duet of their own. The performance begins with long moans, and contains alternate bursts of bellowing and panting. A titi monkey duet can last up to five minutes, and usually ends with extremely loud honking sounds.

Neither of the pair adjusts their pitch or frequency to match the other monkey, but over time the duets become more synchronised. Titi monkeys only sing these duets when in a couple, and don’t make sounds remotely similar in their single lives.

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