The CDC and its Advisory Committee on Immunization Practices (ACIP) now recommend that all adolescents aged 11-18 get vaccinated against meningococcal disease. That's not a radical change from the CDC's old meningitis vaccination schedule. In the past, vaccination of adolescents and young adults was recommended to coincide with specific ages or events, the CDC's Tom Clark, MD, said at a news conference today.
Cool Facts. 1  American Crows congregate in large numbers in winter to sleep in communal roosts. 2  Young American Crows do not breed until they are at least two years old, and most do not breed until they are four or more. 3  In some areas, the American Crow has a double life.
In size they average about 1.15 inches (29.13 mm) by 1.6 inches (41.40 mm) and about .0.6 ounce (17.0 g). Click here to view American crow eggs. Eggs may be laid as soon as the nest is finished but some crows may wait two weeks or more between completion of the nest and laying of the first egg.