Parallel trackways made by boat-tailed grackles: Sapelo Island

Parallel trackways made by boat-tailed grackles: Sapelo Island

Parallel trackways made by boat-tailed grackles: Sapelo Island

Parallel trackways made by boat-tailed grackles in dune sand showing well-defined claw dragmarks; one on left was walking slowly, whereas one on right was walking more quickly: Sapelo Island.

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