Mexican prairie dog of prairie dogs and associated species, such as shorebirds and birds of prey. Pronatura Noreste, as of February 2007, has signed conservation easements with "ejidos" and private owners for the protection of more than 42,000 acres (170 km) of Mexican prairie dog grasslands. Mexican prairie dog The Mexican prairie dog ("Cynomys mexicanus") is a diurnal burrowing rodent native to Mexico. Treatment as an agricultural pest has led to its status as an endangered species. They are closely related to squirrels, chipmunks, and marmots. "Cynomys mexicanus" originated about 230,000 years ago from a peripherally isolated population of the more widespread "Cynomys
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