Bird-census should never disturb the birds or threaten nests. So I join the
opinion of the reaction about the "rope-method". It could be used but only
with lots of people and a very slow tempo.
But just walking with a "row" of people through a field is as usefull for a
census.
A more save method is counting cock-quail that react to a tape of a calling
male. It is a simple method and the risk for significant disturbance is
minimal. it gives a reasonable result for numbers of cock-quail. For a idea
about the sex-ratio you could observe or capture quail in a few tes-areas
where the call-respons is different. Some minor statistic will thenm give
you an idea about quail numbers. By using the same methods every year (or at
least so peridocal that the birds don't get accustumed to the method.
preferably no more than once a year better once in two years) you can follow
and quntify the population-development without knowing exact numbers of
birds (but reasonable estimates, there is literature about the subject).
Perhaps it looks a bit "magical" but I guarantee you that you don't have to
be a scholar to be able to do these kind of things and it is very satisfying
to monitor a species in this way.
Good luck
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