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.
Penguins eat seafood. Their main diet is fish, though they'll also eat squid, small shrimplike animals called krill (see photo to the right) and crustaceans. If you look closely at a penguin's bill you'll notice a hook at the end, perfect for grabbing dinner. They also have backward facing bristles on their tongues that helps slippery seafood from getting away. Penguins don't live near freshwater -- at least none that isn't frozen. Instead they drink salt water.