When they are frightened, Brush Rabbits often thump the ground with a hind foot and may also squeal. These very small cottontails use burrows dug by other animals as escape routes, and sometimes climb into shrubs or low trees to avoid capture. Learn more about the Sylvilagus bachmani, more commonly known as a Brush Rabbit, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.