Looks like he's doing a John Cleese routine.
This great blue heron was bending, stretching,wing flaring his wings as he stood on a log. Didn't seem to notice us in our boat getting closer and closer. We finally left it to finish his routine. Ardea herodias Thanks to specially shaped neck vertebrae, Great Blue Herons can curl their neck into an S shape for a more aerodynamic flight profile and to quickly strike prey at a distance.