Not the first call, but at coolest day.
Koel call at Shatin this morning - probably lower than 8 C degree. Wondering if the relationship between cuckoo call and climate change so stright forward?
Re-read this thread, realized the "guideline" for posting the cuckoo call date. I would suggest the moderator collect the calling information as much as possible, not limited to first call only. If the benchmark is not only the first call dates but also ,say, the fifth call date or tenth call date, the interpretation would be much more convincing from a scientific perspective.
Gary
