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.
Look for the Common Raven's heftier bill, shaggy throat feathers, more slender, pointed wings, and longer, wedge-shaped tail. The crow-sized Chihuahaun Raven of the desert Southwest has a shorter bill, longer feathers around the bill, and less deep voice. Where these two species overlap, the Chihuahuan Raven tends to be in desert at lower elevations and the Common Raven in forests at higher elevations. And here's a useful behavior clue: ravens cruise along roads looking for roadkill.