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Insect Mouths (NatureScope Incredible Insects: page 28) Second Grade Core: Standard 3 Objective 1 Investigate relationships between plants and animals and how living things change during their lives; observe and describe relationships between plants and animals Materials: • Large pictures of a house fly, grasshopper, mosquito and butterfly. • Pliers • Sponge • Toy syringe • Clear drinking glass or beaker • Food coloring • Enough soda straws for the group • Enough milk or juice for the group Procedure: 1. Hang up the pictures of the female mosquito, house fly, grasshopper, and the butterfly/moth. 2. Ask questions about the insects pictured a. Do insects have teeth? Lots of children may say yes since they may have been bitten by an insect. Explain that insects don’t have teeth like people and other animals, just sharp jaws for tearing and chewing food. b. Do all insects eat the same thing? What do insects eat? Different insects eat many kinds of food such as blood, leaves, nectar, dead animals, manure, fungi, wood, and other insects. To eat these different foods, insects have developed different kinds of mouthparts. c. What do mosquitoes/flies/grasshopper/moths eat? They eat different things, and their mouth parts are very different. 3. Then show your class the pliers, sponge, toy syringe, and a straw. Let the class guess which insect has a mouth that is comparable to the items. a. Pliers: A grasshopper’s mouthparts work something like pliers to tear and chew plants. Their jaws move sideways, not up and down like people. b. Toy syringe: Female mosquitoes use their needle-like mouthparts to draw up blood, just like a doctor uses a syringe. (Put a syringe into a glass or beaker containing colored water and suck some up—use food coloring to color the water). c. Sponge: A house fly’s mouthparts work like a sponge to soak up liquids (pour out a little water and sop it up with a sponge) d. Straw: Butterflies and moths often feed on nectar from flowers. They have long, tongue-like mouthparts that are used like a straw to sip up nectar. (Now have the kids be butterflies and moths and sip up their juice with a straw).