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That's not a mistery that more about 1.200 species are able to "walk" on the water surface, from tiny bugs and spiders, to bigger animal, such as reptiles, birds and mamals.

The basilisks can walk on water with their hind legs about 4 feet. All this one happens just in case of danger or threat. basilisks are a group of arboreal lizards found in Central America. Their particular ability is not concentrated to walking on water, but rather than being in constant movement in water. In this way, the reptile lowers the paw, by breaking water's surface tension, and the amount of moved liquid rejects the paw upwards. This allow them to stand for long time and do another step, avoiding to sink. But to remain upright and stable, basilisk also produces strong lateral forces.

Other tiniest bugs can live on water surface thanks to their very light weight which does not break water's surface tension.