Jan. 31, 2012 at 2:47 PM ET
This little was photographed standing completely upright shortly after being let out of his burrow for the first time.
Its siblings checked for the all-clear before exiting the hole.
As soon as their mother was out of sight, the baby squirrels started a playful tussle.
Photographer Eirini Pajak took these adorable shots close to his home in Florence, Ariz.
According to Solent News, Pajak knew it was the little squirrels' first outdoor adventure because he had been watching that particular hole on a regular basis. He shot everything from his car after spending a lot of time parked nearby so the squirrels would get used to him.