* Small size: Budgies are small birds, with an average length of only 7 inches and a weight of only about 1 ounce. This makes them vulnerable to predators, such as cats, hawks, and snakes. As a result, budgies are constantly on the lookout for danger and are easily startled.
* Lack of natural predators: Budgies are native to Australia, where they have few natural predators. This means that they have not evolved to be as fearful of predators as other birds that live in areas with more predators.
* Flocking behavior: Budgies are social birds that live in flocks. This helps them to stay safe from predators and to find food. However, being in a flock can also make budgies more easily frightened, as they are more likely to be spooked by something that one of the other birds in the flock is afraid of.
In addition to these factors, budgies can also be scared by sudden movements, loud noises, and new objects. It is important to be aware of these factors and to take steps to minimize them in order to keep your budgie feeling safe and secure.