Mexican tetra or blind cave fish Astyanax mexicanus. Two form of this fish. The surface-dwelling form (up) is something of a generalist and can be found in all kinds of habitat from flowing streams and rivers to ponds and lakes. The blind form (bellow) occurs only in underground caves and caverns. The two may have diverged as recently as within the last 10,000 years, with the blind form losing its eyes and much of its pigment. It uses its lateral line to detect small changes in the water pressure around it, allowing it to navigate and find food. From Pantepec River

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