Wildebeests, also called gnus, are large African antelopes.
Botulism is a rare but serious illness caused by toxins released by bacteria. These toxins are among the most lethal substances known to man.
Sweating is the human body’s way to keep cool through the evaporation of liquid released from the sweat glands.
Heat stroke is a very serious medical condition that causes at least 240 deaths in the United States each year.
Sunscreen is the best line of defense against skin cancer. However, many people aren't using it correctly.
The adrenal glands affect metabolism, blood pressure, the immune system, sex hormones and the body’s response to stress.
The parathyroids are four small glands that play a big part in regulating the amount of calcium in the blood.
Estrogens are hormones that that are important for sexual and reproductive development, mainly in women. They are also referred to as female sex hormones.
Also called ‘gouty arthritis,’ gout is a painful form of arthritis caused by too much uric acid in the blood. Learn about causes, symptoms and treatment.
The pituitary gland is called the master gland of the endocrine system; it controls many other hormone glands in the body.
Ovaries are the primary female reproductive organs. They secrete hormones and release eggs for fertilization.
The testicles are the primary male reproductive organs. They produce gametes, or sperm, and they secrete hormones, primarily testosterone.
The Tasmanian tiger was the world's largest carnivorous marsupial. Recent unconfirmed sightings have spurred searches for this animal that was presumed extinct over 80 years ago.
Newts are small semi-aquatic amphibians that possess some interesting characteristics. For example, their skin is toxic and they can regenerate amputated limbs. "Astronewts" have also flown in space.
Gila monsters are the largest lizards native to the United States and one of only two venomous lizards in the world.
Warthogs, as the name implies, are related to pigs, and they have growths on their faces that look like warts.
Piranhas are South American fish with razor-sharp teeth and a reputation, somewhat undeserved, for feeding frenzies.
Groundhogs, also called woodchucks, are large rodents. Traditionally, their shadows are used to predict when winter will end.