Changes

[[Mimicry]] has been claimed for this species as well as other related birds of the genus ''Pernis''. According to the theory, it has developed a plumage with designs very similar to those of other stronger and more aggressive birds of prey in order to discourage attacks, which with this species is the immature plumage of the [[Sulawesi hawk-eagle]] (''Spizaetus Nisaetus lanceolatus'')<ref>http://wildlifetraderesearch.org/files/a14_vanbalenetal_pernis_dutchbirding_1999.pdf</ref>.