Landlocked country one, making them the biggest contiguous group in the world. Also, the Central Asian and Caucasian clusters can be considered contiguous, joined by the landlocked Caspian Sea. Mongolia is almost part of this cluster too, being separated from Kazakhstan by only , across Russian or Chinese territory. There are the following "single" landlocked countries (each of them borders no other landlocked country): If the Caucasian countries and Kazakhstan are counted as part of Europe, then Europe has the most landlocked countries, at 20. If these transcontinental countries are included in Asia, then Africa has the most, at 16. Depending on
Gerbil and hardy animal that has become a popular small house pet. It was first brought from China to Paris in the 19th century. It was brought to the United States much later, in 1954, by Dr. Victor Schwentker for use in research. Notably, it is illegal to keep gerbils as pets in California and New Zealand. The gerbil got its name as a diminutive form of "jerboa", an unrelated group of rodents occupying a similar ecological niche. Gerbils are typically between long, including the tail, which makes up about 1/2 of their total length. One species, the great gerbil, "Rhombomys