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.
like human head lice dog lice are usually transmitted in situations where dogs are gathered together in this respect lice infestations are a sign of a pampered pet the dogs most likely to get lice are those who go to dog day care puppy classes agility dog shows or on group walks the lice move straight from dog to dog by direct contact there are two general groups of lice that infest dogs and cats biting lice and sucking lice they differ only in how they feed all lice have powerful claws on all 6 legs with which they cling to the hair shafts they are able to hang on tightly enough that even vigorous scratching and biting will not dislodge them