Sumatran Frogmouth (Batrachostomus poliolophus) [XC241719]
by Frank Lambert from Mount Kerinci, West Sumatra, Sumatra, Indonesia (call)
Sumatran Frogmouth (Batrachostomus poliolophus) [XC621170]
by Mike Nelson from Payung Sekaki, Solok, Sumatera Barat, Indonesia (call, song)
Subspecies
Subspecies mixtus has often been regarded as a separate species, an arrangement apparently initiated in 1937 by cautious uncertainty expressed regarding the characters of the then unknown male of the nominate form. Subsequent to the latter being described in 1938, the two forms seem not to differ greatly in coloration of either sex, and the extreme measurements of each closely approach those of the other, so that their treatment as subspecies of the same species would seem more appropriate. However, possible differences in vocalizations require investigation.
The following 2 subspecies are recognised:
poliolophus Hartert, 1892 - Sumatra.
mixtus Sharpe, 1892 - Borneo. Considered by some authors to be a distinct species, Bornean Frogmouth (Batrachostomus mixtus).
BirdLife International Species Factsheet