Panda’s are known for their notoriously slow movements.

But as this week’s video shows, watching newborn pandas grow from infants to toddlers happens in a flash.

The recently released video shows the development of the Atlanta Zoo’s twin panda cubs, Mei Lun and Mei Hun, over a 100-day period. On day one of the video, the twins are pink and helpless, but by day 100, they wear the iconic black and white markings and appear to be quite the handful.

Check out the video above to see Mei Lun and Mei Hun in action.

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