I took this photo at the Woodland Park Zoo in Seattle. I am hoping that someone can tell me what kind of rattler it is so I can label my photos 

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I took this photo at the Woodland Park Zoo in Seattle. I am hoping that someone can tell me what kind of rattler it is so I can label my photos 

That is a Eastern Diamondback, Crotalus adamanteus.
.......he hardly even looks offended that you didn't recognize him in all his 'grandeur'.what a beast.
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"with head raised regally,and gazing at me with lidless eyes,he seemed to question with flicks of his long forked tongue my right to trespass on his territory" Carl Kauffeld
He was a great photographic subject. And I'm not too good with my rattler ids 
>>.......he hardly even looks offended that you didn't recognize him in all his 'grandeur'.what a beast.
>>-----
>>"with head raised regally,and gazing at me with lidless eyes,he seemed to question with flicks of his long forked tongue my right to trespass on his territory" Carl Kauffeld
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