A parasite is an organism that lives in another organism, called the host, and often harms it. It is dependent on its host for survival - it has to be in the host to live, grow and multiply. A parasite cannot live independently. Although a parasite rarely kills the host, in some cases it can happen. The parasite benefits at the expense of the host - the parasite uses the host to gain strength, and the host loses some strength as a result.
This picture states that parasites can get into your hair.
It shows that how many different parasites can get into animals
This shows that parasites can get into your eyes and may cause you to be blind.