本期內容簡介

一個巨蚌一生中只有一次機會找到適合的家，
一旦把自己扣緊在礁石上，餘生就在那兒度過了。
巨蚌能夠長到巨大的規模，是由於摄取了居住在牠們組織當中的數十億共生藻所製造出來的糖和蛋白質。
作為交換，巨蚌提供了一個安全的住所給共生藻，讓海藻接觸到陽光，進行光合作用。白天的時候，巨蚌會打開貝殼，露出多種顏色的內膜組織。
牠們也會利用虹吸管過濾海水，並進食一些路過的浮游生物。

A giant clam gets only one chance to find a nice home. Once it fastens itself to a spot on a reef, there it shall stay for the rest of its life.

Giant clams grow to their enormous size by consuming the sugars and proteins produced by the billions of algae that live amongst their tissues. In exchange, they offer the algae a safe home and regular access to sunlight for photosynthesis, basking by day below the water’s surface with their fluted shells open and their multi-coloured mantles exposed. They also use a siphon to draw in water to filter and consume passing plankton.