What could be a sign that a raptor is experiencing stress?

Exhibiting aggression towards handlers is a significant indicator that a raptor is experiencing stress. Raptors are typically calm and controlled in their interactions; when a bird begins to show aggression, it often means that something is unsettling or threatening to it. This stress can arise from various factors such as unfamiliar environments, handling techniques that the bird is uncomfortable with, or even the proximity of potential threats. Observing aggressive behavior can be a clear sign that the bird is feeling cornered or threatened, prompting it to use aggression as a defense mechanism.

The other behaviors noted may not necessarily indicate stress in the same direct manner. For example, while flapping regularly could be part of normal behavior or exercise, tucking its head into its body can be a resting position or a sign of contentment for some birds. Ruffling feathers excessively is often a part of normal maintenance behavior or a way to regulate body temperature. However, it's important to closely observe the context of these actions, as they can vary widely based on the individual bird and its environment.