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The ornamental design for an owl calling whistle, substantially as shown and described. |
FIG. 1 is a reduced perspective view of an owl calling whistle embodying my new design.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a front elevation view thereof.
FIG. 5 is a side elevation view thereof, the opposite side being a mirror image.
FIG. 6 is a rear elevation view thereof.
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