Lyrebirds are shy and difficult to approach, particularly Albert's lyrebird, so little information about its behaviour has been documented. When lyrebirds detect potential danger, they pause and scan the surroundings, sound an alarm, and either flee the area on foot or seek cover and freeze.
Diet and feeding Lyrebirds feed on the ground, usually as individuals. A range of invertebrate prey is taken, including
insects such as
cockroaches,
beetles (both adults and
larvae),
earwigs,
fly larvae, and the adults and
larvae of
moths. Other prey taken includes
centipedes,
spiders, and
earthworms. Less commonly taken prey includes
stick insects,
bugs,
amphipods,
lizards, frogs, and occasionally
seeds. They find food by scratching with their feet through the
leaf litter. This activity also improves forest health by burying potential wildfire fuel and by measurably increasing the diversity of invertebrates. Such positive effects cover millions of hectares of land.
Breeding Lyrebirds live as long as 30 years. They have long breeding cycles and start breeding later in life than other passerine birds. Female superb lyrebirds start breeding at the age of five or six, and males at the age of six to eight. Males defend territories from other males, and those territories may contain the breeding territories of up to eight females. Within the male territories, the males create or use display platforms; for the superb lyrebird, this is a mound of bare soil; for the Albert's lyrebird, it is a pile of twigs on the forest floor. in an elaborate
courtship display performed for potential mates, of which the male lyrebird has several. The strength, volume, and location of the nest built by the female lyrebird is dependent on the rainfall and predation during the nest-building period. The nest must be water resistant and hidden in secluded areas so predators cannot attack. Once the nest is made in the preferred location, the female lyrebird lays a single
egg. The egg is
incubated over 50 days solely by the female, and the female also fosters the chick alone.
Vocalizations and mimicry A lyrebird's
song is one of the more distinctive aspects of its behavioural biology. Lyrebirds sing throughout the year, but the peak of the breeding season, from June to August, is when they sing with the most intensity. During this peak, males may sing for four hours of the day, almost half the hours of daylight. The song of the lyrebird is a mixture of elements of its own song and mimicry of other species. Lyrebirds render with great fidelity the individual songs of other birds and the chatter of flocks of birds, and also mimic other animals, such as possums, such as a mill whistle, a cross-cut saw,
chainsaws,
car engines and
car alarms,
fire alarms,
rifle-shots,
camera shutters,
dogs barking, crying babies, music, mobile-phone ring tones, and even the human voice. While the mimicry of human noises is widely reported, the extent to which it happens is exaggerated. The superb lyrebird's mimicked calls are learned from the local environment, including from other superb lyrebirds. An instructive example is the population of superb lyrebirds in Tasmania, which have retained the calls of species not native to Tasmania in their repertoire, with some local Tasmanian endemic bird songs added. The female lyrebirds of both species are also mimics capable of complex vocalisations. Superb lyrebird females are silent during courtship, but they regularly produce sophisticated vocal displays during foraging and nest defense. A recording of a superb lyrebird mimicking sounds of an electronic shooting game, workmen, and chainsaws was added to the
National Film and Sound Archive's
Sounds of Australia registry in 2013. Both species of lyrebirds produce elaborate, lyrebird-specific vocalisations, including whistle songs. Males also sing songs specifically associated with their song-and-dance displays. One researcher, Sydney Curtis, has recorded flute-like lyrebird calls in the vicinity of the
New England National Park. Similarly, in 1969, a park ranger, Neville Fenton, recorded a lyrebird song that resembled flute sounds in the New England National Park, near Dorrigo in northern coastal New South Wales. After much detective work, Fenton discovered that in the 1930s, a flute player living on a farm adjoining the park used to play tunes near his pet lyrebird. The lyrebird adopted the tunes into his repertoire, and retained them after release into the park. Neville Fenton forwarded a tape of his recording to
Norman Robinson. Because a lyrebird is able to carry two tunes at the same time, Robinson filtered out one of the tunes and put it on the phonograph for the purposes of analysis. One witness suggested that the song represents a modified version of two popular tunes in the 1930s: "The Keel Row" and "Mosquito's Dance". Musicologist David Rothenberg has endorsed this information. However, a "flute lyrebird" research group (including Curtis and Fenton) formed to investigate the veracity of this story found no evidence of "Mosquito Dance" and only remnants of "Keel Row" in contemporary and historical lyrebird recordings from this area. Neither was able to prove that a lyrebird chick had been a pet, although they acknowledged compelling evidence on both sides of the argument. ==Status and conservation==