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.
Yes, dogs and cats do sometimes get lice, although lice are not one of the more common parasites diagnosed. They are most common in animals that live in poor conditions without proper sanitation. Dogs can get two different types of lice: Trichodectes canis and Linognathus setosus. Cats get only one type: Felicola subrostrata. Other types of animals are susceptible to other species of lice. But each species of animal is only infected by their own special species of lice.