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 roadrunner is legendary for its speed, its unique appearance and because it is fast enough to catch and eat even a rattlesnake. Roadrunners are faster, large brown and what or black and white birds that sport a head crest, strong legs and feet and a tail that is long and tipped in white. The bill of the roadrunner is almost comically large and is useful to gather snakes and other prey. The roadrunner can range from 20 to 24 inches from the tip of his tail to the beak.