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Tracker calls the snake Señor Serpiente ("Mr. Snake" in English). She is later revealed to be female because she had babies, so Tracker was mistaken when he addressed her as a male. However in "Pups Jungle Trouble", after Marshall thought she was a vine, Carlos said, "Don't worry, Marshall. He's a friendly snake." It's unknown if each snake is a different snake. At least the one in Jungle Trouble because it was a different color than the other two. And the other two snakes weren't friendly.
The snake is light green with yellow lips and a long pink tongue.