Coyote

Coyote, Canis latrans, near Beaver Meadows, with that lean and hungry look.

Caesar:
Let me have men about me that are fat,
Sleek-headed men and such as sleep a-nights.
Yond Cassius has a lean and hungry look,
He thinks too much; such men are dangerous.
-- Shakespeare, Julius Caesar Act 1, scene 2

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Rocky Mountain National Park: The High Peaks