ความคิดเห็นที่ 27
No, it is not unexpected to find such redshank in northern Thailand since from this month on towards late October, they are on passage to wintering ground along Gulf coast.
Most shorebirds (if not all) migrate in the night and stop by their chosen habitats to feed. This is why we can find such passage migrant along its route to wintering ground, and by night migration it provides much more advantages over migration during the day which is unlike some raptors such as Buteo hawks, Butastur buzzards, Accipiter sparrowhawks or eagles that require thermals and such raptors normally won't be afraid of any predators since they actually are (except human beings).
Thus the status of this species on Chiang Mai province list (if any has been compiled to date) should be "passage migrant", and the trend of such passage migrant can be seen anyway in suitable habitats. And it is no surprise to find a few shorebirds overwintering on such passage locations without flying furtherdown to their usual wintering ground, though that can be UNUSUAL and should be recorded for long term interpretation of such trend.
Shorebirds, in particular, are prone to such trend (of being found along the way downward) as long as there are suitable habitats along its route to wintering ground.
This trend is not unlike any other passage migrant species, for example Ferruginous Flycatcher can be found in mainland Thailand (in suitable habitats i.e. lowland forests or woodland in suburbs/towns if there are enough insects to sustain its need and build up more body fat as energy resource for long-distance migration) during migration, but will disappear from such passage sites to winter in Thai-Malay peninsula and Philippines.
จากคุณ :
Trogon 
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7 ก.ย. 46 00:16:30
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