Aggressive behavior is also linked to stress. A cockatoo that suddenly starts biting, lunging, or displaying defensive body language may be feeling threatened or overwhelmed. Stress from overcrowded cages, loud environments, unfamiliar people, or lack of proper training can lead to aggression. Observing body language such as raised crest feathers, widened eyes, or stiff posture can help owners recognize early warning signs. how smart are african grey parrots
