  A seagull ({\it Larus crassirostris}) has a high ability to realize its safe,
accurate and smooth landing. We examined how a seagull controls its angle of
attack when landing on a specific target. First, we recorded the landing
behavior of an actual seagull by multiple video cameras and quantified the
flight trajectory and the angle of attack as time series data. Second, we
introduced a mathematical model that describes how a seagull controls its speed
by changing its angle of attack. Based on the numerical simulation combining
the mathematical model and empirical data, we succeeded in qualitatively
explaining the landing behavior of an actual seagull, which demonstrates that
the control the angle of attack is important for landing behavior.
