As a result, your immune system attacks healthy cells. Depending on the type, an autoimmune disease can affect one or many different types of body tissue. It can also cause abnormal organ growth and changes in organ function.There are as many as 80 types of autoimmune diseases.s a result, your immune system attacks healthy cells. Depending on the type, an autoimmune disease can affect one or many different types of body tissue. It can also cause abnormal organ growth and changes in organ function.
The diet of pelicans usually consists of fish, which can be up to 30 cm (1 ft) long, but amphibians, turtles, crustaceans and occasionally birds are also eaten. Aquatic prey is most commonly taken at or near the water surface.
Some beaks are big, with the ability to get bigger. For example, the pelican has a pouch-like beak it can expand when it's trying to scoop up fish. Brown Pelicans are known for diving into the water to catch fish. However, American White Pelicans float on the surface and scoop up fish as they swim by. The pouch on the pelican's lower bill is usually folded up, but it can get bigger when the bird is fishing. A pelican's pouch can hold three gallons of water. During a typical fishing trip, the pelican will start by filling its expanded pounch. The pouch then contracts, and the water drains out.