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Yinepu, don’t know; but I am enthusiastic to post this text:
S.E. reckons emus understand at least twenty or thirty calls/variations of calls. His rough list includes:
Chicks’ cheeps: calls to locate dad, which come in degrees of stress. (Chicks’ whistles??)
Dad: a grunt to answer the chicks, and a grunt that tells them ‘Follow me.’
General alarm
Calls that signal status/warn off other birds
Hisses that are parts of the ‘rush-flare-hiss’ action
‘kook kook kook’s that guide a flock through the bush. S.E. has heard a flock of eighteen pass through scrub, and they communicated at length among themselves as they moved.
Similar calls that a female uses to ‘direct’ a male. I have seen Felicity do this a number of times, and you’d swear the male in question was on a length of rope. F. uses these when she’s calling a new consort to come and share wheat.
Calls that advertise interest in mating, including the fantastic pre-dawn calls whereby males and females ‘make appointments’ to meet after dawn. I’m not kidding. This is a no-brainer.
Calls between males and females, to make appointments during the day.
Females’ night-time strings of booms in mating-season: there are at least ‘single’ and ‘double’ booms. Strings vary from six to twenty booms per string. They vary in the lengths of time between the strings. They vary in volume, and in nature also: sometimes the birds sound almost asleep.
Females’ ‘vocal reconnaissance’ – I think this warns birds nearby. Females do this while mobile. Or are they signalling males??
Females’ ‘territory-marking’ strings of booms: an elaborate inter-female series of booms. They do this while stationary, in the morning. They are exchanged between females as much as a half a mile away
Going-beddy-byes-at-dusk grunts to themselves – emus talk to themselves!
Finally, guys: the wild birds, when in groups of six or eight, while in conflict, may vocalise a hundred times an hour. That is, they talk back and forth constantly for quite long periods, and over quite large areas.
S.E.
Yinepu, found this while hunting for a detail on Mating-Season in Australia. 'B.E.' is a male.
'I slip out to ‘look/listen for patterns.’ B.E. does exactly the same thing as yesterday: a few quiet guurrkks. Then a string of really spirited gurks, with the swan-neck thing, which almost get down to the boom-ey bass of the female call. I sit and listen. A couple of minutes later, a female calls quietly, just once, down the back.
S.E.
Yinepu, I’m listening on your behalf:
heard a male – grunts: definitely male – talking to a female here. The male’s grunts were really similar to a ‘string’ of female booms. Yes, they were grunts, but deep, almost as deep as booms, and in strings.
S.E.