In 2008, a YouTube video featuring an Eleanora cockatoo named Snowball dancing to the beat of the Backstreet Boys went viral. His killer moves stunned scientists, since the ability to synchronize body movements to music was believed to be a uniquely human activity. Nor is Snowball an isolated case. Griffi the Dancing Cockatoo has his own YouTube channel, for example, and a recent TikTok video showed two sister cockatoos engaging in a dance-off to Earth, Wind & Fire's "September." But it's Snowball who holds the Guinness World Record for most dance moves performed by a bird.

Snowball's record might be in jeopardy, however. A new paper published in the journal PLoS ONE investigated dancing behavior in several parrot species and identified 30 distinct dance moves that the birds executed—17 of which had never been observed scientifically before and were performed by just one bird. So dancing in cockatoos and other parrot species seems to be much more complex and varied than previously thought. It's still unclear why parrots in captivity love to dance so much, but encouraging such behavior could help birds like these thrive in an environment they often find challenging.

Researchers at Charles Sturt University (CSU) in Australia scoured YouTube, Facebook, and TikTok for video footage of dancing birds, particularly cockatoos. For videos to be selected for inclusion in the study, they had to meet several criteria: They had to show a cockatoo in a domestic setting where music was being played at the same time the bird was dancing (videos where music had been added to the footage were omitted); the bird must demonstrate at least two different dance moves; and the camera angle had to provide a good view of the dancing bird. And each video had to feature a different bird.

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© Duncan Rawlinson/CC BY 2.0

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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 since morphed into a distinctive singing style. But can animals also yodel? According to a new paper published in the Philosophical Transactions of the Royal Society B, Biological Sciences, several species of monkey dwelling in the rainforests of Latin America employ "voice breaks" in their calls that acoustically resemble human yodeling—i.e., "ultra-yodels" that boast a much wider frequency range.

Many years ago, I wrote about the bioacoustics of human yodeling for New Scientist. In many respects, yodeling is quite simple. It merely involves singing a long note subjected to repeated rapid sharp shifts in pitch. It's the unique anatomy of the human vocal tract that makes it possible, notably the larynx (voice box) located just behind the Adam's apple. The larynx is comprised of cartilage and the hyoid bone that together support the vocal cords, which are attached to muscles on either side of the larynx.

When air flows through the trachea, the vocal cords vibrate at frequencies ranging from 110 to 200 Hz. We have the capability of contracting the muscles to change the shape, position, and tension of our vocal cords, thereby altering the pitch of the sound produced. Stiffer vocal cords result in faster vibrations, which produce higher pitches.

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© Jacob Dunn, Anglia Ruskin University