A lone visitor to Uaguitupo Island woke to a battering at her wooden doors, only to find a land crab so large it dwarfed her hiking boots\u2014and her sense of calm.<\/p>\n\n\n\n
Sarah, a travel writer from the United States, chose the quiet coral ring of Uaguitupo in Panama\u2019s San\u202fBlas archipelago for research and respite. Instead, a full\u2011moon tide delivered an unforgettable houseguest: a red land crab with a shell roughly the width of a car tire that muscled its way inside and sent her belongings skittering across the sand\u2011floored cabin.<\/p>\n\n\n\n
The Guna Yala region teems with thousands of red land crabs that usually max out at six inches across. Marine biologists blame rare growth\u2011spurts on an abundant post\u2011rainfall diet of coconut husks and mangrove detritus, combined with genetic quirks. <\/p>\n\n\n\n
During the November full moon, hormonal changes drive the biggest individuals to forage and defend territory, turning a usually cautious crawler into a door\u2011ramming heavyweight. Ever pictured a gladiator in armor scuttling sideways? Sarah saw exactly that when her visitor\u2019s claws rattled the hinges until the doors burst open. Just how exceptional was her crustacean adversary? The numbers speak for themselves.<\/p>\n\n\n\n