脑珊瑚里的圣诞树管虫。
这是圣诞树蠕虫的防御机制，它们中的大多数栖身在活珊瑚上挖出的“地道”里。
It's a defense mechanism of the Christmas tree worm, most of which resides in a tunnel it carves into live coral.
圣诞树蠕虫在珊瑚礁栖息地庇护一只虾虎鱼(左)。
Christmastree worms shelter a goby (at left) in their coral reef habitat.
圣诞树蠕虫在珊瑚礁栖息地庇护一只虾虎鱼(左)。
Christmastree worms shelter a goby (at left) in their coral reef habitat.
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