The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).AIDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.Without treatment, average survival time after infection with HIV is estimated to be 9 to 11 years, depending on the HIV subtype.IDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. Without treatment, average survival time after infection with HIV is estimated to be 9 to 11 years, depending on the HIV subtype.
Black Tortoise. The Black Tortoise or Black Turtle is one of the Four Symbols of the Chinese constellations. Despite its English name, it is usually depicted as a turtle entwined together with a snake. Further, in East Asia, it is not called after either animal but is instead known as the Black Warrior under various local pronunciations.
Ciconiidae. The Black-necked Stork is the only species of stork that occurs in Australia. Its name is a little misleading, as the birdâs neck is black in only with poor views. At other times, it has can be seen to have an iridescent green-and-blue sheen.eeding. The Black-necked Stork feeds on fish, small crustaceans and amphibians. Most prey is caught by the bird jabbing and seizing it with its large bill. Some food is caught by lunging forward with a large stride or by leaping into the air.