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I observed that Sandhill Crane aggression is more posturing and acrobatics than actual physical contact. I witnessed dozens of ninja-like kick boxing episodes and rarely observed actual physical contact among the combatants. On several occasions I did observe the beak grabbing behavior that is depicted in this image.
Antigone canadensisnew mexicosandhill cranebernardobirdflock
From Sandhill Cranes of Bernardo, New Mexico January 2018