$5.00 Melissa & Doug Animals Jumbo Knob Wooden Puzzle Fish - Each extra-thick wooden puzzle has three pieces with easy-to-grasp wooden knobs that fit just right in small hands. Three favorite pets live in a fishbowl-shaped puzzle board a fish, a turtle and a crab. . Full-color, matching pictures appear underneath each piece. Jumbo knob puzzles are a great activity to encourage hand-eye coordination and visual perception skills