garden gardening insect mollusc mollusk pest shell snail snails gardens horticulture invasive japanese knotweed pests problem problems species weed Australian blue Cockatoos corellas demonstrative destructive docile flock garden pest grazing Noisy pet root eater show-off talker vocal white yellow tail feathers cling damp green growth lichen parasite plants reindeer food beaks birds branches eucalyptus-tree fauna gum-tree native tree wildlife appearance appearances black-and-white clothed clothes clothing cord funny garden-people greyscale hats hession lifelike no-birds pest-control protection rope scarecrow scary stuffed stuffing control hat poles shirt slacks stick straw electrical-supply electricity falconiformes feathers garden-pest iconic overhead-power-lines perch perching perching-birds powerlines powerpoles root-eater sky suburban tail wires animal Arion ater creep England english invertebrate natural nature orange red repulsive revolting shell-less Slime slimy slug