Large-billed Reed Warbler
(Photo by Philip D. Round)
small, unstreaked Acrocephalus warbler (pictured
left) was caught during routine monitoring and ringing of
migratory birds in conjunction with the Wildlife Research
Division of the Department of National Parks and the royally
Pak Bia Environmental Research and Development
Project, Phetchaburi Province, SW Thailand, approximately
3,100 km from the type locality, on 27 March 2006.
specimen of A. orinus was recently re-examined (Bensch
and Pearson 2002), confirming its status as a bona-fide species.
Morphological and genetic analyses of the Laem Pak Bia bird
confirmed its identity as A. orinus, and revealed
that there was sufficient genetic variation to indicate the
continued existence of a viable population.
this species is an addition to the Thai list, where the population
might breed or winter is still unknown. This, just the second
record ever, does not throw much light on where A. orinus
might normally be found. The fact that both records occurred
in the northern hemisphere's winter period and that the closest
relative, Blyth's Reed Warbler A. dumetorum, winters
in southern Asia, it is thought that A. Orinus probably
breeds somewhere in the Palaearctic, wintering in southern
Asia, most likely to the west of Thailand, possibly in Myanmar
or the Indian subcontinent. It is quite possible that it could
winter alongside Blunt-winged Warbler A. concinens,
or A. dumetorum, but has remained undetected due
to its close similarity to these species in the field.