‘Do you often see emus like LC and Offsider who seemingly pair up, but do not produce chicks?’
Well, first: we don’t know that LC and Offsider won’t breed because it’s still months to breeding time. LC and Offsider are unusual in that they formed a pair so very early.
And otherwise? Well, here is what we know, Antique:
if a Planet Rothschildi female brings her consort here and breeds, which has only happened two times in 17 years, we know that a pair bred. If a Planet Rothschildi male brings his chicks here on the Tour of Life, then we know that a pair bred – but we don’t know the female because the breeding/incubation happened elsewhere.
Otherwise, over the years we have seen quite a lot of prospective consorts come and go – that is, a female brings them here. Then the pair usually just go bush again. Sometimes the male doesn’t make the grade, and leaves.
[We had one rejected male come back one time, in company with a female. It was just fortunate that the male in question had distinctive markings, and was recognised months later: Speckles and Mrs. Speckles.]
So once again, the situation is insufficient data.
Years ago, we took a wild wild guess at how many emus – male, female, chicks – might be on this property at any given time. And what we determined is that we don’t know. We know that there are emus in this district – we see them regularly. We know that they breed – we see Dads with their clutches. We know a good deal about territorial behaviour and mating – these things we can learn about from our observations. But total numbers, and cohorts thereof, no.