Mangrove Tree Crab (Aratus pisonii), Ding Darling National Wildlife Refuge, Sanibel Island, Florida, USA
mangrove tree crab shown above occupies mangrove swamp environments.
It usually lives among red mangroves - Rhizophora mangle (en.wikipedia.org/wiki/Rhizophora_mangle).
At low tide, the crabs are near or on the ground. During high tide,
they ascend tree trunks, often to relatively high levels. Mangrove tree
crabs are omnivorous - they are principally herbivores, feeding on
mangrove foliage, but are also detritovores, scavengers, and predators
on small invertebrates and some protists.