Khao Dinsor was placed firmly on the birding map when, in 2008,
it was realised that large numbers of raptors pass close to and
along the ridge on their southward, autumn, migration between mid
August and mid November. In the years since, a raptor centre - for
educational purposes - has been constructed, and each year in mid to late
October a Raptor Migration Weekend is held. Volunteers, observing the migration,
are present yearly with all of September and October monitored. Migration varies
with month, and on a day to day basis, heavily dependent on wind, cloud cover
and rain. It is estimated that somewhere between 250,000 - 500,000 raptors,
of more than 25 species, pass annually. In addition, each year several species,
rarely recorded in Thailand, turn up.
Other migrants also pass through with all three species of needletail recorded.
