Indeed they are quite "vibrant", as the article states: > This may also explain the mantle colors of giant clams. The idea is that the vibrant colors of giant

Indeed they are quite "vibrant", as the article states: > This may also explain the mantle colors of giant clams. The idea is that the vibrant colors of giant clams are not due to optical differences in the tissue, but rather differences in the distribution or abundance of symbionts relative to iridocytes in each individual.