Sandhill Cranes form monogamous pair bonds, they mate for life and remain together year around. This pair of Sandhill Cranes (Grus canadensis) silently forage as they wade a "Crane Pool" at sunrise. Sandhill Cranes spend each night roosting in water safe from coyotes and other predators.
Marbled Godwit (Limosa fedoa) at Morro Bay, California.
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.