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.
Some of the black birds are more aggressive and are feared by other birds. The ravens and crows are scavengers, who will feed on carrion and farm crops. The blackbirds, cowbirds and the starlings prefer insects and farm crops such as wheat and other cereal types.