Black-crested Bulbul is one of world’s 100 of the "worst" invasive species. Originally, the residence of Black-crested Bulbul is in Indian Subcontinent.
After it had be introduced to Pacific Islands, the original birds, agricultural products or fruits had been attracted or damaged.
For the other characteristics of Black-crested Bulbul, there is no any significant difference when compare with other type of Bulbul.