Prairie dog itself more noticeable to the predator. Predators, though, seem to have difficulty determining which prairie dog is making the call due to its "ventriloquistic" nature. Perhaps the most striking of prairie dog communications is the territorial call or "jump-yip" display of the black-tailed prairie dog. A black-tailed prairie dog will stretch the length of its body vertically and throw its forefeet into the air while making a call. A jump-yip from one prairie dog causes others nearby to do the same. Ecologists consider this rodent to be a keystone species. They are an important prey species, being the primary diet
Dog type on dog types such as "hound" or "terrier". Some group categories cover more than one type; working dog refers to dogs that do some sort of work for humans, in contrast to companion dogs which are pets, although working dogs can also be companions, and companion dogs can do useful work. The terminology is unclear; see Working Group and Utility Group. Mixed-breed dogs can have any combination of working and companion functions and be of any type. Toy dogs are very small dogs of any type. See Toy Group. Ancient dog breeds are modern breeds genetically identified as descending from