A mouse robbed the Gem Stop Chevron convenience store on Island Avenue Thursday.

A mouse with no larceny in its heart but a taste for $20 bills.

The tiny rodent squeezed into the automated teller machine inside the store and made a nest with $20 bills.

“I saw these beady eyes and a lot of chewed up $20 bills,’’ Taylor said.

She slammed the ATM’s door shut and screamed. Then she composed herself.

“I stayed calm until the customers left.’’

Taylor then carefully opened up the ATM machine and found a nest made from torn up $20 bills.

“It was a pretty spendy nest,’’ Taylor said.

The mouse had completely torn up two $20 bills and damaged 14 others. Fortunately, a bank replaced the 14 bills that were not extensively damaged. But the two other $20 bills were a total loss.

No bills damaged by the mouse were dispensed to customers.

The mouse, unharmed, was taken outside and allowed to run away.

“There was not a trial or anything,’’ Taylor said with a laugh.

Gem Stop employees are still mystified as to how the mouse got in the ATM machine.