Owls’ silent flight is commonly attributed to their special wing morphology combined with wingbeat kinematics. One of these special morphological features is the leading-edge serrations: rigid miniature hook-like patterns found at the primaries of the wings’ leading-edge. It is hypothesized that leading-edge serrations function as a passive flow control mechanism, impact the aerodynamic performance, supposedly alter the boundary layer over the wing, and the wake dynamics. We study the flow physics associated with owls’ leading-edge serrations using an owl wing with mimicked serrated geometry at Rec=40,000. We measured the flow characteristics of the boundary layer over the wing for various angles of attack (6o-20o) using PIV in a water channel. The experimental results suggest that leading-edge serrations modify the boundary layer over the wing. At low angles of attack (<20o), the serrations amplified the turbulence activity over the wing planform. At 20o, the serrations act to suppress existing turbulence conditions, presumably by causing an earlier separation closer to the leading-edge region, thus enabling the flow to reattach prior to shedding downstream. These results served as a benchmark for numerical simulations using DNS to elucidate the underlying mechanisms of the flow dynamics due to presence of these micro-structures. The 3D simulations shown that the serrations improve suction surface flow by promoting sustained flow reattachment via streamwise vorticity generation at the shear layer, prompting weaker reverse flow, and thus augmenting stall resistance. However, aerodynamic performance is negatively impacted due to the shear layer passing through the serration array which results in altered surface pressure distribution over the upper surface.