*Samurai Helmet Beetle* or *Japanese rhinoceros beetle* or *Japanese horned beetle*, or *Kabutomushi* (カブトムシ?), _Trypoxylus dichotomus_, is a species of rhinoceros beetle found in Japan, Korea, Taiwan and China.
It is *sold as a pet in department stores* in many countries of Asia, where it is also frequently depicted in popular media as a *common cartoon character* for various uses, for example much as cartoon bears, lions, or alligators are seen in advertisements and product labels in the United States.
Many *children of Japan buy, or catch, these bugs* and breed them. At hardware stores, males cost about 350-1000 yen, (around three to ten US dollars) while the females cost much less. The reason is because they have no horns at all.
*Kabutomushi* are a very popular *subject in gambling*, like Siamese fighting fish and cricket fights. In the most popular game, two different male beetles are placed on a log. The two beetles will battle each other, trying to push each other off the log, the one to stay on the log is the winner. This is a huge source and loss of money to many people, especially in the Ryukyu Islands.