No, being obsessed with cockatiels or any other specific interest or hobby is not inherently a sign of autism. Having strong interests or passions in particular subjects is a common human trait and can be seen in people with or without autism.
Autism Spectrum Disorder (ASD) is a neurodevelopmental condition characterized by a range of social, communication, and behavioral differences. While individuals with autism may have intense interests in specific topics, not everyone who has such interests has autism.
It's essential to avoid making assumptions or stereotypes about autism or any other condition based on isolated interests. If you or someone you know has concerns about autism or any other aspect of mental health or neurodevelopment, it is best to consult with a qualified healthcare professional for a proper evaluation and guidance. They can provide a thorough assessment and offer appropriate support or resources if needed.