I found out this snake was a surucucu. In English it is called a bushmaster.
This snake is the largest poisonous snake in South America, and one of the largest poisonous snakes in the world. It is a viper whose venom is extremely lethal, according to this article below.
Brazilian link about the surucucu or bushmaster snake.
I got mixed up. I thought the poisonous snakes had slanty eyes, triangle heads and thin narrow tails. Since this snake had none of these I assumed it was not poisonous. Hmmm. You ever get that mixed up?
This snake is also known here in Brazil as the bico-de-jaca, surucutinga, or surucucu-de-fogo.
Here are some bushmaster/surucucu snake photos I pulled off the internet. Same round head. Same round eyes. Same thick tail. Same heavy scales. Same attitude radiating outward.
I learned a good lesson here: “Don’t put shelves right beside you main house entrance”.
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