A grove of ancient pecan trees draws a large number of gray squirrels to the farm. These industrious mammals are scatter hoarders. They can hide thousands of caches every year and feed on the stored nuts and seeds during times of scarcity. Primarily nesting either in collections of sticks and leaves called dreys or hollow tree trunks, female gray squirrels can give birth twice a year. They also do not hibernate. Instead they often share their nests on cold winter nights. Crepuscular by nature, gray squirrels are most active in the early morning and evenings.