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.
Crows lay larger and more eggs, averaging three to nine, compared to the grackle's one to seven. Crow eggs incubate as much as a week longer than grackle eggs. Once hatched, crow chicks stay in the nest 20 to 40 days, more than twice as long as grackle chicks at 10 to 17 days.