Not so much experience with Galahs mimicking Corellas, but they are
quite 'close'! Some years ago, living in Bogabilla (northern NSW)
our neighbours had a caged Galah, to which lots of wild Galahs
visited, and they fed them. For around 40 years, a 'pair' of a Galah
and a Little Corella had been visiting regularly - each year bringing
their hybrid offspring. The young never lasted more than a season -
I guess predators and/or the flock are specially hard on such hybrids.
I've heard of people deliberately breeding hybrid parrots, but this
was an interesting and long-lasting 'natural' hybridization.
While we were there, the Corella was hit by a car on the highway and
killed, and so after about 40 years, the visits stopped.
John Tongue
Ulverstone, Tas.
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