Great Blue Heron mourns his mate

I saw a really sad sight on entering the Green Cay Wetlands a few days ago. A Great Blue Heron was standing guard over the remains of another one who had evidently met an untimely death. There were dozens of people on the boardwalk taking photos, but he just remained absolutely motionless, looking so distraught and disheveled. I felt really sorry for him, as he was obviously grieving and didn’t want to leave his mate.

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I wonder what happened. Maybe an alligator.