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
Breed type (dog) English Mastiff standard cautions, "Judges should also beware of putting a premium on showiness." "Breed type" usually takes into account the work the original dog type from which the breed was developed was bred to do. In order to counterbalance the overuse of appearance in awarding championships, some major registries and breed clubs have instituted performance events as part of the awards at conformation shows. Dog type, "breed type", dog breed, and purebred dog breed are at times all used interchangeably, but they all have distinct meanings. "Types of dogs" are varieties developed for a specific work; they may be