In the sulfur-infused ponds of Tabasco state in Mexico lives a tiny silver slip of a fish, the sulphur molly.
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Every few seconds, thousands of these fish will repeat a quick diving motion to generate the wave, sometimes for up to two minutes.
The mollies are prey for an array of winged predators, including egrets, kingfishers and kiskadees. When birds dive to attack, the mollies flash and swirl.
It seems to be aimed at predators perched on the shore,
The sulphur molly (Poecilia sulphuraria), locally known as molly del Teapa, is a critically endangered species of fish in the family Poeciliidae. It is endemic to Mexico, specifically to the Baños del Azufre (Grijalva River basin) near Teapa, Tabasco.
The Baños del Azufre are sulfidic springs that contain high concentrations of toxic hydrogen sulfide (H2S). Poecilia sulphuraria has apparently evolved the ability to tolerate the toxic conditions. A few other Poecilia species are known from similar habitats in Mexico.
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