Ladies with Twins: Different levels of action on ultrasound?

solarflare

For those of you with twins, I was so interested to see MOVEMENT for the first time today. Wow - so awesome and mindblowing!

So I was wondering, when you see your twins is there usually one that is more active than the other? Is this consistent every time? Like does A always look like a super gymnast while B looks like they're chilling in a hammock, or does it switch off every time?

My Baby A was jumping and waving.  Baby B was just chillin' and looked like it was sucking it's thumb. It only had subtle movements. I was just so fascinated by their differences.