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.
The pied crow is smaller and has a white chest and belly with a black, more delicate beak compared to the black chest and belly of the larger white-necked raven which also has a white tipped and weightier beak.ied crows are generally encountered in pairs or small groups, although an abundant source of food may bring large numbers of birds. The species behaves in a similar manner to the hooded and carrion crows. In Dakar, birds have been observed mobbing passing ospreys and snake eagles but avoiding black kites.