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Blanco 1, a 100Myr open cluster in the solar neighborhood, is well known forits two 50pc-long tidal tails. Taking Blanco 1 as a reference, we find evidenceof early-stage tidal disruption in two other open clusters of ~120Myr: thePleiades and NGC 2516, via Gaia EDR3 data. These two clusters have a total massof 2-6 times that of Blanco 1. Despite having a similar age as Blanco 1, thePleiades and NGC 2516 have a larger fraction of their members bound: 86% oftheir mass is inside the tidal radius, versus 63% for Blanco 1. However, acorrelation between Blanco 1's 50pc-long tidal tails and the "kinematic tails"in velocity space is also found for the Pleiades and NGC 2516. This evidencesupports the idea that the modest elongation seen in the spatial distributionfor the Pleiades and NGC 2516 is a result of early-stage tidal disruption.

Evidence of Early-stage Tidal Structures of Open Clusters Revealed by Kinematics with Gaia EDR3