Large synchronized arrivals of sea turtles to beaches, where thousands come ashore together to nest in a single event.
From Spanish 'arribada' (arrival), derived from 'arribar' (to arrive at port). Marine biologists adopted this Spanish term to describe the spectacular mass nesting events of sea turtles like leatherbacks and olive ridleys.
Olive Ridley sea turtles participate in arribadas involving hundreds of thousands of individuals—they emerge en masse from the ocean and cover beaches so densely that some get exhausted crawling over others to reach nesting sites.
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