Musk, a substance with a strong, penetrating odor. It is obtained from a large abdominal gland of the male musk deer. Musk activates sperm cells during the mating season and its scent attracts females. Musk is an oily brownish liquid when fresh, a grainy powder when dried. Diluted with alcohol, it is used in perfumes to slow evaporation. The characteristic odor of musk is caused by a substance called muscone, or muskone, which can be synthetically produced. Other animals, such as the muskrat, and some plants yield musklike substances.
Darter is a name for a group of small fish of the perch family. Darters swim about in short dashes, propelled by fins on the breast.
Unlike many of the peaceful fish suited to an aquarium, the African Congo tetra likes to jump! Learn how to protect him and keep him happy in his aquarium.