The branching coral technique. Cuttlefish used this 12 percent more often when hunting purple mangrove crabs, which were better armed and armored than other crabs.CreditCredit...Matteo Santon ...

The occasional orchid. Rarely, a vine. A troop of fiddler crabs guarding holes in the mud. A big mangrove crab low on a trunk. Some insects. A tricolored heron perched on the stilt of a mangrove root.