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.
Some Very Basic Pigeon Facts. Pigeons mate for life and rear their broods together, although if one dies the other will take a new mate. Once the simple nest is built, the female lays an egg and then another a day or so later. The incubation period for common pigeons is 17 to 19 days. The female sits on the egg from late afternoon through the night until about 10AM. The male then takes over and does the day shift.