I suggest read the reference and or look at the
graph in the GBS Report. As the January abundance is about half that of
December, observations in January could hardly be described as "very few".
Indeed January is the month with the second highest abundance for the species
locally. Although that applies to GBS data over all of Canberra and you may only
be referring to Weston Creek (although I don't see why that should be any
different). Also the GBS Report and observations do not differentiate between
heard and seen observations. More to the point, the GBS Report covers just the
first 21 years, during which and clearly since, the Koel has been on the
increase locally. Therefore the baseline information (as shown in the GBS
Report) is still being established. Also as a corollary of an increased
occurrence and abundance, it is reasonably to be expected that the period of
weeks per year that it is recorded here would also have increased, from whatever
was known or recorded "previously".
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