The range of A. pisonii extends from eastern Florida to northern Brazil, throughout the Caribbean, and on Pacific coasts from Nicaragua to Peru (Rathbun 1918, Chace & Hobbs 1969). The mangrove tree crab migrates vertically, usually inhabiting tree canopies during high tide and venturing down to exposed sediments during low tide.Although the crabs are most commonly associated with the red mangrove, Rhizophora mangle, populations also reside among the branches of the black mangrove, Avicennia germinans; the mangrove, Avicennia schaueriana; the white mangrove, Laguncularia racemosa and the tea mangrove, Pelliceria rhizophorae (Conde et al. 2000). The mangrove tree crab is a common inhabitant of red mangrove, R. mangle, forests throughout the lagoon (Rader & Reed 2005), although crabs can also be found in and around the white mangrove, L. racemosa and the black mangrove, A. germinans.