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.
Human lice need human blood to survive, dog lice need dog blood, and so on. Therefore, if your child comes home from school with a diagnosis of head lice, your dog, cat, or other pets in the household are not at risk from catching the lice or hatching eggs. Conversely, while not as common in dogs and cats, the species of lice that live on dogs and cats are not able to live on humans. While not an immediate threat to health, human head lice is very contagious and is not an indicator of poor personal hygiene.