|To:||Robin Hide <>|
|Subject:||Magpie-larks nest-building delays...|
|From:||Martin Butterfield <>|
|Date:||Sat, 9 Nov 2019 03:39:14 +0000|
I have looked at a set of GBS records I still have on my computer and of the 143 sheets with NB for Magpie Lark 4 sheets report 5 consecutive weeks with NB. One of these then reports, after an interval of three weeks, a second go for 2 weeks. In another case the string of 5 consecutive weeks follows 1 week of NB and then a gap of 1 week. There are a further 4 sheets with NB recorded for 4 consecutive weeks.
Of course it may be the activity commenced on the last day of the 1st week of the sequence and ended on the first day of the final week reducing the actual build periods to 3 weeks and 2 days and 2 weeks and 2 days respectively but that would be an unlikely coincidence if it occurred in every case.
That is of course a very superficial glance at the data but it would take a lot of effort to nut out the full story behind each event. However I think it allows
me to conclude is that your birds are probably more industrious than the average but it is not an unprecedented level of activity.
In terms of the birds investment of time and energy I suspect for some species (not, of course Magpie-larks) larger amounts of energy and possibly similar amounts of time are devoted to migrating to breeding grounds. The biological imperative to breed is a powerful thing!
On Sat, 9 Nov 2019 at 13:32, Robin Hide <> wrote:
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