Menarche. The average age of menarche, or first menstruation, in the United States is 12.88 years for Caucasian girls and 12.16 years for African American girls.A popular misconception is that menarche marks the beginning of puberty; in reality, menarche occurs later in puberty.enarche. The average age of menarche, or first menstruation, in the United States is 12.88 years for Caucasian girls and 12.16 years for African American girls.
Quick Answer. Roadrunners eat insects, lizards, scorpions, small birds, rodents and snakes, including rattlesnakes. During the winter months when its preferred food is scarce, the roadrunner may supplement its diet with fruits, seeds and other vegetable matter. Continue Reading.
The legendary roadrunner bird is famous for its distinctive appearance, its ability to eat rattlesnakes and its preference for scooting across the American deserts, as popularized in Warner Bros. cartoons. The roadrunner is a large, black-and-white, mottled ground bird with a distinctive head crest. It has strong feet, a long, white-tipped tail and an oversized bill. It ranges in length from 20 to 24 inches from the tip of its tail to the end of its beak. It is a member of the Cuckoo family (Cuculidae), characterized by feet with 2 forward toes and 2 behind. When the roadrunner senses danger or is traveling downhill, it flies, revealing short, rounded wings with a white crescent.