There are at least two bird species of bulbuls found in North America. Bulbul bird species in general are native birds of Asia, and have been introduced into North America. Some can be found in the southern tropical forests of Asia right into Japan. While other species of bulbuls are found in drier more sparse landscapes.
The Red-whiskered Bulbul is seen in Florida, where their numbers are stable at this time. They are accepted as a North American breeding bird species and they are on the ABA birding list.
The Red-vented Bubul is native to India, Bangladesh, Sri Lanka, Burma, Bhutan and Nepal. They have been introduced to many other areas in the world. They can be found in the city of Houston, Texas.
Bulbuls in general are seed and fruit eaters, and are recognized as crop pest in some countries, where they have been introduced to.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.