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A list of the behaviors common to autism and ADHD are below. 

Autism Behavioral Checklist

• Difficulty mixing with other children;
• No real fear of danger;
• Tantrums: displays extreme distress for no apparent reason,
• Inappropriate giggling or laughing,
• May not want cuddling or act cuddly,
• Noticeable physical overactivity or extreme underactivity;
• Little or no eye contact,
• Works impulsively;  often makes careless mistakes: work is sloppy,
• Uneven gross/fine motor skills

ADHD Behavioral Checklist

• Cannot talk or play quietly; disrupts others with talk or actions,
• Difficult awaiting turn in games or activities, 
• Engages in potentially dangerous activities,
• Plays without normal caution or  consideration of consequences,
• Severe temper tantrums,  
• Interrupts, disrupts, talks and acts inappropriately,
• When younger, difficulty accepting soothing or holding,
• Always on the move, overactive, even during sleep,
• Often does not seem to listen when spoken to directly,
• Often does not give close attention to details or makes careless mistakes in school work or other activities,
• Uneven gross/fine motor skills.