most are thought to feed at night on sponges, while during the day they search for dark areas or remain hidden under rocks. the bridge itself was  long with  ramps at either end. the students were divided into four teams; team 1 (years 0–2) took the first 25 years, team 2 (years 3–4) took the next 25 years, team 3 (years 5–6) took the next 25 years, and team 4 (years 7–8) took the last 25 years. the back side also shows black dots and lines. 