WHAT UP WITH THE MICE?

We haven't had a mouse inside the house in years, but in the last week Isis and Ramses have caught two of them. (Both times, Leanna and I woke up in the middle of the night during the crashing fury of an active game of "get the mouse".) The warehouse next to ours is full of food, and they never had mice (been here 15 years) until this year?

Global Warming?