Produced in Spanish, this series contains 20 lessons on the intermediate level for teachers to use in foreign language science study. Nubian goats are the most popular of the six officially recognized breeds of dairy goats raised in the United States. Their high, rounded faces, variable coloration and pattern, their short slick coat, and long floppy ears easily distinguish Nubians. Because their milk has higher butterfat content than other dairy goat breeds, Nubian goats are the preferred breeds. In fact, Nubian goats are also the largest desert breeds. Nubian goats are a domesticated breed; therefore, they do not exist in the wild.