When going through withdrawal, craving is a psychological
urge to administer a discontinued medication or recreational drug. The duration
that cravings last after discontinuation varies substantially between different
addictive drugs. For instance, in smoking cessation, a substantial relief is
achieved after approximately 6–12 months, but feelings of craving may
temporarily appear even after many years following cessation. Cravings may be
triggered by seeing objects or experiencing moments that are associated with
the drug or usage of it, and this phenomenon, termed post acute withdrawal
syndrome, may linger the rest of the life for some drugs. For the alcohol
withdrawal syndrome, the condition gradually improves over a period of months
or in severe cases years.
Thursday, 14 March 2013
Wednesday, 2 May 2012
Hooded Oriole
Adults have a pointed bill and white wing bars. The adult male has an orange head with black on the face and throat; they are black on the back, wings and tail, orange on the underparts. The adult female is olive-green on the upper parts, yellowish on the breast and belly.
Their breeding habitat is open areas with trees, especially palms, across the southwestern United States and northern Mexico. The nest is a tightly woven pouch attached to the underside of a leaf or tree branch.
These birds migrate in flocks south to Mexico's southwestern coast; they are permanent residents in Baja California Sur, the Mexican east coast, and Belize. Some may over-winter near feeders.
They forage in trees and shrubs, also feeding from flowers. Because it pierces the base of the flower, it does not assist in pollination. These birds mainly eat insects, nectar and fruit, and will also visit hummingbird feeders.
Thursday, 8 December 2011
Purple Heron
The Purple Heron breeds in colonies in reed beds or trees close to large lakes or other extensive wetlands. It builds a bulky stick nest.
It feeds in shallow water, spearing fish, frogs, insects and small mammals. It will often wait motionless for prey, or slowly stalk its victim. It tends to keep within reedbeds more than the Grey Heron, and is often inconspicuous, despite its size.
It has a slow flight, with its neck retracted. This is characteristic of herons and bitterns, and distinguishes them from storks, cranes and spoonbills, which extend their necks. The long neck of Purple Heron looks particularly snake-like, with more of an S-shape in flight. The call is a loud croaking "krek".
The Purple Heron is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
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