Crabs Put the Pinch on Marshlands

Crabs Put the Pinch on Marshlands,
September 2011,
Live Science,

Video length: 02:34.

Marshes are being overrun by purple marsh crabs because their main predators, blue crab and finfish, are being overfished. So, the purple marsh crabs are free to gorge on healthy fields of cordgrass and once done feeding, they leave behind nothing.