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.
There is a general perception that because these birds feed on crops and are discouraged from this act, that they have become more aware of mankind, developing different methods to avoid people and thought to be more intelligent than most other bird types.rom the large ravens and crows to the medium size grackles and into the smaller birds, such as blackbirds, cowbirds, and starlings. All these birds are found mostly in fields and at other times in the woods.