is medium-sized, measuring in total length, including a small tail that averages . Weight can range from , with an average of around . The female tends to be heavier, although the sexes broadly overlap in size. There may be some slight variation in the body size of eastern cottontails, with weights seeming to increase from south to north, in accordance with Bergmann's rule. Adult specimens from the Florida Museum of Natural History, collected in Florida, have a mean weight of . Meanwhile, 346 adult cottontails from Michigan were found to have averaged in mass. Due to Eastern Cottontails being so small and since they don’t usually fight back they are easy prey for other animals such as coyotes, bobcats, and even foxes. Behavior The eastern cottontail is a very territorial animal. When chased, it runs in a zigzag pattern, running up to . The cottontail prefers an area where it can be out in the open but hide quickly. Forests, swamps, thickets, bushes, or open areas where shelter is close by are optimal habitation sites for this species. Cottontails do not dig burrows, but rather rest in a form, a shallow, scratched-out depression in a clump of grass or under brush. It may use the dens of groundhogs as a temporary home or during heavy snow. Eastern cottontails are crepuscular to nocturnal feeders; although they usually spend most of the daylight hours resting in shallow depressions under vegetative cover or other shelter, they can be seen at any time of day. Eastern cottontails are most active when visibility is limited, such as rainy or foggy nights. Eastern cottontails usually move only short distances, and they may remain sitting very still for up to a few hours at a time. Eastern cottontails are active year-round. Reproduction The onset of breeding varies between populations and within populations from year to year. The eastern cottontail breeding season begins later with higher latitudes and elevations. Temperature rather than diet has been suggested as a primary factor controlling onset of breeding; many studies correlate severe weather with delays in the onset of breeding. In New England breeding occurs from March to September. In New York the breeding season occurs from February to September, in Connecticut from mid-March to mid-September. In Alabama the breeding season begins in January. In Georgia the breeding season lasts nine months and in Texas breeding occurs year-round. Populations in western