Tiles Diamond Pattern

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We found a snake about 8-9 inches long in the pool today here in East Texas. He is not particularly aggressive but the last inch or so of his very pointed tail is bright yellow. The rest of him is brown with very distinctive markings. They kind of look like Italian ceramic tiles laced over his back. Not quite diamonds but a definate pattern. Is he harmless? This is the third one we've seen in two weeks.
Sounds a little like a copper head. If this is a copper head than yes he is very venomous. Appearance
The Northern Copperhead Snake has a stocky body that may be copper, orange or pinkish in color. Dark, chestnut-colored bands cross the body, breaking the color pattern into alternating bands of darker and lighter color. Young copperheads are lighter in color than the adults, and they have a yellow-tipped tail that they often flick. This habit is believed by some to lure prey to them.
The non-venomous Eastern Milk Snake has similar coloring and is sometimes confused with the adult Northern Copperhead Snake. The Eastern Fox Snake does not live in the same part of Ohio as the Northern Copperhead Snake, but it resembles this venomous snake and sometimes is mistaken for it.















