Jack and Jill
Jack (on the right) and Jill (on the left). About the only way to tell them apart is Jill's white patch on the back of his neck and his white middle toes. He's also just a bit bigger than Jack. Both of them are giving me that 'what the heck are you doing in here?' look.
Jack is 16 and Jill is 9 years old.
Jack coming for a closer look at the camera.