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Those grackles are engaged in a courting behavior, most frequently called “bill tilt.” It's also been called “head up” or “head up threat.” While establishing pairs for mating, males vie for the at...
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Those grackles are engaged in a courting behavior, most frequently called “bill tilt.” It's also been called “head up” or “head up threat.” While establishing pairs for mating, males vie for the at...