Leader of the Pack

Red Girl is leader of the pack. She scurries over the side of the box instantly and then turns and encourages her sibling to join her. They scream and wiggle waiting for some human to push their little bodies over the top so they can join her. Green Boy is the only other one who can make it over on his own, but he can't get back into the box like she can. And would you believe she is the smallest one?