Pre-Columbia spheres dated to 600 AD were discovered near the Diquis River of Southern Costa Rica. The diameter of these stones vary from a few centimeters to several meters, with the largest weighing several tons. The maximum circumference error of a typical 2 meter sphere was only 1.25 centimeters or 2%.
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Acrocinus longimanus - The harlequin beetle is a large tropical insect native to the Americas. An average adult is 7.5 centimeters in length; the males have forelegs as long as their entire body. These legs are used primarily during courtship and mating. Both sexes have pseudoscorpions, tiny insects resembling scorpions, but without the stingers, living under their wings. This benign relationship is referred as phoresy, a relationship between organisms with one relying on the host primarily for transportational purposes.
