13 Mammal Observation Table You will need the following to build such a table:— 1. A base board - e.g. plywood 50 cm x 1 metre 2. Lengths of softwood for the frame about 2 cm x 2 cm 4 lengths a 3 lengths b 2 lengths c 3. Chicken wire - mesh size 1 cm 4. Nails, U tacks, etc. 5. Perspex or board (about half size of base