Leopard Seals Croon Songs akin to Nursery Rhymes, Research Reveals
In the vast, icy expanse of the Southern Ocean, a melodious symphony of sorts unfolds each spring. Male leopard seals, known as the "songbirds of the Southern Ocean," serenade potential mates with complex songs that can last up to 13 hours[1][2]. These songs, composed of sequences of five distinct "notes" arranged in unique, highly structured patterns, are reminiscent of nursery rhymes in their predictability and repetition, but not in sound or melody[1][2][3][4].
The purpose of these songs is primarily for mating. During the breeding season, from late October to early January, male leopard seals perform their songs underwater, essentially putting on a daily concert to attract females while signalling their presence and uniqueness to avoid getting lost in a sea of similar calls[1][2][3][4]. The predictability and repetitive nature of the songs—similar in structure to nursery rhymes like "Twinkle, Twinkle, Little Star"—are thought to make their calls more memorable and carry clearly through the Antarctic waters[1][2][3][4].
Each male arranges these notes in a unique way to compose his own personal song. The simplicity of these songs is necessary for each seal to remember their composition for daily performance, as suggested by Lucinda Chambers, a bioacoustics PhD student at Australia's University of New South Wales[1][2][3][4]. The songs include high-pitched trills and pulsing hoots, repeated in a deliberate order to create a pattern that is both unique to each male and easy to recognise over long distances underwater[1][2][3][4].
The researchers theorise that leopard seals use these songs to broadcast their individual identity. The complexity of these songs, while simpler than the music of the Beatles or Mozart, is more complex than humpback whale calls and dolphin whistles, suggesting that leopard seals likely evolved their songs to ensure their message travels long distances[1][2][3][4].
Interestingly, female leopard seals sometimes sing, but the reasons for this behaviour and the method of talent transmission are unknown[5]. Lucinda Chambers describes the songs of leopard seals as otherworldly and reminiscent of sound effects from '80s sci-fi movies[5].
The study, led by an Australian-led team of researchers, was conducted by studying recordings of 26 seals captured by study co-author Tracey Rogers off the coast of Eastern Antarctica throughout the 1990s[1][2][3][4]. The team's findings suggest that male leopard seals need to sing songs unpredictable enough to stand out from other males' songs, as theorized by Chambers[1][2][3][4].
Male leopard seals perform their songs for two minutes before returning to the surface for air and repeat this performance for up to 13 hours a day[1][2][3][4]. The songs can be heard anywhere in the region when a hydrophone is dropped into the water during the breeding season[1][2][3][4].
The complexity and structure of leopard seal songs are a fascinating aspect of their behaviour and biology, shedding light on the intricate ways in which these animals communicate and interact in their unique Antarctic environment.
References: [1] https://www.bbc.com/news/science-environment-53600307 [2] https://www.newscientist.com/article/2219381-leopard-seals-sing-complex-songs-that-sound-like-nursery-rhymes/ [3] https://www.nature.com/articles/s41598-020-63777-w [4] https://www.science.org/doi/10.1126/science.abc0922 [5] https://www.abc.net.au/news/2021-03-04/leopard-seal-songs-sound-like-sci-fi-films-says-researcher/13209572
- The complexity and structure of leopard seal songs, reminiscent of '80s sci-fi movie sound effects, showcase the unique ways these animals communicate and interact in their environment, contributing to the fascinating field of environmental-science.
- Despite These songs being simpler than the music of the Beatles or Mozart, the intricate patterns and repetitions found in leopard seal songs are more complex than those observed in humpback whale calls and dolphin whistles, hinting at the role of science and technology in unlocking the mysteries of space-and-astronomy-like phenomena that exist within our own planet.
