Topiary Dinosaur on National Museum of Natural History Grounds, by Penland, Dane A, 1990, Smithsonian Archives - History Div, Topiary dinosaur built out of steel rods and angle iron wrapped with chicken wire, the frame was filed with sphagnum moss containing soil in which to plant the leafy dino's coat. Admiring their handiwork are, from left, Gardener Robert Burgess; Gardener/Leader Walter Howell, who designed and built the critter; Gardeners Antonie Myles (Top), Thomas Brown and Kurt Donaldson; and Modelmaker Reed Martin, who helped build the topiary..