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Did You Know?
In Did You Know? the National Geographic magazine team shares extra information we gathered to expand your knowledge of our featured subjects.

Crabs are a keystone species in the mangrove world. They consume and bury the leaf litter, in some areas removing nearly 80 percent of the total amount each year. As crabs process this litter, they release a significant amount of nutrients, such as nitrogen, back into the sea, contributing to the overall health of the mangrove forests. Crab larvae are also an important food source for juvenile fish on nearby shores.

—Karen Courtnage