The buzzing sound of the wings signals their approach and, if you are lucky, they will fly up and perch on your finger to take the food.
The hummingbirds are hand fed by keepers in the aviary.
mnli hypothesis: The hummingbirds are hand fed by keepers in the aviary. premise: The buzzing sound of the wings signals their approach and, if you are lucky, they will fly up and perch on your finger to take the food.