Is it true that boy toddlers are more aggressive than girl toddlers?

i have two daughters and i can say that there was definitely a marked difference between them both at their toddler age. similarly, there is definitely a difference in the way two boy toddlers will behave. that said, there are girl and boy toddlers who are very naughty and aggressive, and also boy and girl toddlers who are very calm and quiet. i wouldn't say we can generalize :)