Water striders live on the water surface and their leg length ranges from several to over 100 millimeters. It is well known that they use their long hydrophobic legs and support their bodies on the surface without breaking it. Under each leg, the water surface bends down creating a dimple (meniscus). Heavier water striders create deeper dimples, which produce stronger upward force from the downward stretched water surface that supports the insect body.
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Source: Phys.org