There is some concern that as male wrybills sit on the nest during low light periods ( dawn and dusk) and through the night, and females on the nest during the day- (as a rule of thumb on rivers that are monitored) - that male wrybills may be more vulnerable to mammalian predation.
I have no hard data analysed yet to support this hypothesis- but it would be relevant to investigate. If anyone is looking through wrybill flocks on their southward migration could they please record the number of males and number of females . Please email to me at langlands@xtra.co.nz
Note Male wrybills have a distinct solid black line on their forehead, females do not.
photograph of male bird shown .
Thanks
Peter
No comments:
Post a Comment