The main signs of a bat infestation are piles of rice grain-sized droppings and dark urine stains. Ammonia smells, scratching and squeaking at night, or bats around your yard are also common signs.

Bats pollinate plants and control insects but also transmit diseases to humans. Researchers investigate ways to prevent viral spread.

Bats are a familiar sight in Arizona’s night skies, fluttering above saguaro silhouettes, gobbling up mosquitoes and pollinating desert plants. Bats are mostly helpful, rarely harmful and play a vital ...