Meet the Lyrebird: The bird that can mimic an entire forest for survival

The superb lyrebird, Menura novaehollandiae, is renowned for its extraordinary vocal abilities, capable of imitating the calls of other birds, environmental sounds, and even human-made noises. While male lyrebirds have long drawn attention for their elaborate courtship displays, the vocal repertoire of females has remained largely unexplored. Recent research challenges the assumption that female lyrebirds are silent or less significant, revealing complex, context-dependent songs that serve essential survival functions. Understanding these vocalisations reshapes perceptions of sexual selection in birds and reveals the ecological strategies that allow these songbirds to thrive in dense Australian forests. Their mimicry and vocal versatility highlight a sophisticated communication system extending beyond the spectacle of male display.Adult superb lyrebirds are striking in form, weighing close to one kilogram. Males are instantly recognisable by their ornate, lyre-shaped tail feathers, which fan out during courtship displays. Females, though less showy, have evolved subtle traits that support survival. Their brown plumage provides effective camouflage, particularly when incubating eggs or protecting chicks. The tail of a nesting female often becomes slightly bent from long hours of sitting, a subtle sign of her parental role. While males display extravagance to attract attention, females embody quiet resilience, balancing energy between foraging and nest defence. Their understated appearance conceals an intelligence and adaptability equal to their male counterparts.Superb lyrebirds are native to southeastern Australia, thriving in wet sclerophyll forests, temperate rainforests, and gullies lined with ferns and moss. They favour regions rich in biodiversity, where the abundance of sounds offers endless material for mimicry. Males typically occupy and maintain display mounds within their territories, while females defend their own feeding and nesting areas nearby. These habitats also provide protection, as the dense vegetation conceals both adult birds and nests from predators. Seasonal shifts influence behaviour: breeding months bring an increase in vocal activity, while cooler periods see quieter routines centred on feeding and territory maintenance. Their habitat shapes their acoustic world.Superb lyrebirds are omnivorous ground foragers, feeding mainly on insects, spiders, worms, and other invertebrates found beneath the forest litter. They use strong, curved bills to probe the soil and turn over leaves, revealing the tiny creatures hidden below. Interestingly, female lyrebirds often sing while feeding, producing species-specific whistle songs. Researchers suggest this may signal territorial presence or facilitate communication with nearby females. Feeding behaviour, therefore, doubles as an opportunity for vocal expression, linking foraging with social communication. By maintaining a balance between nutrition and alertness, female lyrebirds ensure both their own survival and the protection of their offspring in predator-rich environments.Female lyrebirds, long thought to be mostly silent, produce an impressive range of vocalisations including whistle songs, alarm calls, and complex imitations of other species. A study published in Frontiers in Ecology and Evolution found that female mimicry serves multiple purposes distinct from male courtship. When foraging, females employ whistle songs; when threatened, they mimic alarm calls or predator sounds to ward off danger. They can even replicate the cries of hawks or the warning calls of other birds. This behaviour likely functions as a form of deception, deterring predators or competitors. In contrast to males’ decorative mimicry, females use imitation strategically, enhancing survival during nesting and feeding.While male lyrebirds mimic for attraction, female mimicry is grounded in necessity. Their songs are shorter, sharper, and more situation-specific. Female lyrebirds sing to defend nests, claim territories, or mislead potential predators. They also appear to learn mimicry differently, possibly from neighbouring females rather than male models. This divergence reveals a deeper evolutionary purpose behind their vocalisations. The female’s song, once dismissed as secondary, is now recognised as a crucial element of her behavioural ecology. By using sound tactically, females turn mimicry into a tool for protection and communication, rather than performance, an insight that redefines assumptions about avian song complexity.The discovery of elaborate female vocalisations challenges the idea that birdsong evolved solely through male sexual selection. Female lyrebirds show remarkable adaptability, adjusting their vocal repertoire to fit ecological and social contexts. Their whistle songs signal confidence during foraging, while their mimicry deters predators and rivals. This behavioural sophistication suggests that female song has deep evolutionary roots, serving practical and communicative purposes. By observing these hidden performances in the forest understory, researchers are uncovering how sound, learning, and survival intertwine. The female superb lyrebird, once overlooked, now emerges as one of nature’s most skilful vocal strategists, quietly shaping her own place in the forest symphony.Also Read | How sea snakes evolved to smell underwater: Insights from their changing olfactory genes