In addition to the megafauna, Massachusetts was also home to a variety of smaller animals, such as deer, rabbits, squirrels, and birds. The climate of Massachusetts was much colder during the last ice age, and the state was covered in glaciers. As the glaciers retreated, the climate began to warm up, and the landscape of Massachusetts changed. This change in climate allowed for the development of new plant and animal communities, and the state eventually became home to the forests, meadows, and wetlands that we see today.