The Red-Vented Bulbul seems always to be in motion. The bulbul are monogamous, non-migratory birds who mate for life and raise two broods (up to three eggs per clutch) yearly. Bulbul eat fruits and do hundreds of thousands of dollars worth of damage to Hawaii’s fruit crops each year. They also eat insects on the wing.
Bulbul are a non-native species and are considered invasive — not just because of crop damage, but because of their aggressive nature and breeding practices. Bulbuls have crowded out many of the native birds and claimed those territories for themselves.
I took this photo on the University of Hawaii at Moanoa campus, but there are many bulbul right here at home. Quite a large contingency of them live in the mango tree outside my front window. They squabble and sing, fight and play within its branches all day long. They also dig long thin gashes in the mangoes when they feed. Once the fruit is opened by the bulbul, it becomes infested with other critters — flies and such — and is often spoiled beyond redemption before the tree releases its grasp and drops the fruit to the ground.