Teens and young adults are at increased risk for meningococcal meningitis. What is meningococcal meningitis? The Centers for Disease Control and Prevention (CDC) recommends 2 doses of quadrivalent meningococcal conjugate vaccine for adolescents 11 through 18 years of age.
Physical Differences. Crows and ravens differ physically from one another, their size being the most noticeable. Ravens are larger than crows, making them the largest perching birds. Crows have a smooth texture whereas the raven has a dense and shaggy plumage particularly around the throat. The bill of the raven is also heavier than the crow's bill. During flight, the spreading of the tail can distinguish the crow and raven apart. The tail of the crow spreads into a fan-like structure while the tail of the raven spreads into a wedge shape.
  Answer2.   The common crow does live in the deserts, but in limited numbers.  The common raven, a larger rel â¦ ative of the crow, is found there, as  is the Chihuahuan raven. Ravens are similar in appearance to crows,  but are larger, with shaggy throat feathers and a larger bill.ell cared for crows in captivity can live upwards of 40-50 years because they do not have to contend with bad weather and enjoy the benefit of a regular food supply.