Corals are made up of tiny animals known as polyps. Each of the polyps has a skeleton cup, tentacles with stinging cells, a mouth and a stomach. Algae grow in the stomach lining and supply calcium which the polyp uses to build the skeleton cup. Here's a neat model of a coral polyp your students can make.
Chewing lice are not as common as fleas and ticks, but just as itchy and annoying. Learn about the different types of lice out there and how to protect your pets. While lice may not be as common as fleas, they can still cause aggravation in some animals, especially animals who are very young, old, or sick. There are two types of lice that affect cats and dogs: sucking lice (which suck blood) and chewing lice. Chewing lice are tiny, flat, wingless insects that feed on the dead skin of pets.
There are two types of lice, i.e. biting or chewing lice and blood sucking lice. Both can infest dogs and cause discomfort, skin irritation and other related integumentary (related to skin) symptoms. These are host specific, i.e. cannot be transmitted to animals other than dogs, and are not harmful to people. Canine lice cause the coat to feel scruffy and dry, and cause symptoms such as hair loss and severe itching. In cases of severe infestation, blood sucking canine lice can cause anemia, especially in puppies. Diagnosis is based on clinical examination, where dog lice can be isolated from the hair, and eggs can be examined under microscope. Getting rid of dog lice is accomplished with sprays, dips and bathes.