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.
Africa has two species of crow; the Black Crow, Corvus capensis, and the Pied Crow, Corvus albus. Both species have similar habits to the Carrion Crow though breeding occurs at different times in different parts of Africa in response to the widely variable environmental conditions.he ten species of Ravens in the world are the largest members of the family Corvidae and of the genus Corvus. They are distinguished as a group from crows mainly by their greater size. Ravens occur all over the world, though most do not have the large distribution of Corvus corax, the Common Raven.